alexa
Reach Us +1 218 451 2974
Patterns of Variation in Botanical Supplement Use among Hispanics and Latinos in the United States | OMICS International
ISSN: 2161-1165
Epidemiology: Open Access

Like us on:

Make the best use of Scientific Research and information from our 700+ peer reviewed, Open Access Journals that operates with the help of 50,000+ Editorial Board Members and esteemed reviewers and 1000+ Scientific associations in Medical, Clinical, Pharmaceutical, Engineering, Technology and Management Fields.
Meet Inspiring Speakers and Experts at our 3000+ Global Conferenceseries Events with over 600+ Conferences, 1200+ Symposiums and 1200+ Workshops on Medical, Pharma, Engineering, Science, Technology and Business
All submissions of the EM system will be redirected to Online Manuscript Submission System. Authors are requested to submit articles directly to Online Manuscript Submission System of respective journal.

Patterns of Variation in Botanical Supplement Use among Hispanics and Latinos in the United States

Keturah R. Faurot1,2,*, Amanda C. Filipelli3, Charles Poole1 and Paula M. Gardiner3

1Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA

2Program on Integrative Medicine, Department of Physical Medicine & Rehabilitation, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-7200, USA

3Program for Integrative Medicine and Health Care Disparities, Department of Family Medicine, Boston University School of Medicine, Boston, MA 02118, USA

Corresponding Author:
Keturah R. Faurot
Department of Epidemiology
Gillings School of Global Public Health
University of North Carolina at Chapel Hill
Chapel Hill, NC 27599, USA
Tel: +251932409399
E-mail: [email protected]

Received Date: April 14, 2014; Accepted Date: July 25, 2015 Published Date: July 31, 2015

Citation: Faurot KR, Filipelli AC, Poole C, Gardiner PM (2015) Patterns of Variation in Botanical Supplement Use among Hispanics and Latinos in the United States. Epidemiol 5:195. doi:10.4172/2161-1165.1000195

Copyright: © 2014 Faurot KR, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Visit for more related articles at Epidemiology: Open Access

Abstract

Background: The prevalence of botanical supplement use among Hispanics/Latinos in the United States varies widely, thwarting efforts to understand patterns of use in these rapidly growing populations. In this systematic review of the literature, we present an analysis of patterns of botanical supplement use across available studies including Hispanics/Latinos in the United States, 1998-2011.

Methods: Search strategies included CINAHL, EMBASE, Global Health, CAB Abstracts, AMED and Medline resulting in 33 studies reporting botanical supplement prevalence among Hispanic/Latino adults, limiting studies to those with similar outcomes and Hispanic/Latino sample ≥1%.

Results: Median prevalence of botanical supplement use among Hispanics/Latinos varied from 12% for ≤30 days of use to 27% for 6-12 months of use and 45% for 2+ years of use. Variation in prevalence of botanical use among Hispanics/Latinos was largely dependent on study design factors, particularly sampling strategy and target population. Patterns associated with higher median prevalence included regional (42%, 95% CI: 35, 57%) vs. national (15%; 8, 22%) samples, convenience (45%; 35, 63%) vs. probability sampling (21%; 10, 42%), and majority Hispanic/Latino (45%; 32, 67%) vs. majority non-Hispanic/ Latino (21%; 15, 42%) samples. Studies targeting Hispanic/Latino populations with botanical assessments specific to these populations resulted in higher prevalence estimates (49% vs. 18%). The most common botanicals reported by Hispanics/ Latinos across studies were chamomile, aloe, and garlic.

Conclusions: Although studies with probability sampling are less affected by selection bias, most target the general US population and exclude botanical supplements common among Hispanic/Latino populations. Improved estimates of botanical supplement use among Hispanics/Latinos require culturally-relevant assessment instruments and strategies. Assessments of botanical supplement use in other ethnic populations, e.g., among immigrants from Asian countries, are also likely to suffer from information bias.

Keywords

Dietary supplements; Hispanic/Latino; complementary and alternative medicine; prevalence

Introduction

Rationale

In the United States (US), botanical dietary supplements are regulated by the Food and Drug Administration under the 1994 Dietary Supplement Health and Education Act. The Act defines dietary supplements as “a product (other than tobacco) that is intended to supplement the diet that bears or contains one or more of the following dietary ingredients: an herb or other botanical, a vitamin, a mineral, an amino acid, a dietary substance for use by man to supplement the diet by increasing the total daily intake, or a concentrate, metabolite, constituent, extract, or combinations of these ingredients” [1].

Botanical supplements are popular in the US; national surveys estimate that approximately 18% of the US population uses botanical supplements [2,3]. The literature supports a wide body of prevalence data on botanical supplement use in the general population, but less is known about use patterns in minority populations, including Hispanics/Latinos [3-6]. Among studies in these populations, prevalence estimates vary widely and the reasons for these large variations are obscure. Due to the increasing population of Hispanic/ Latino patients and the biological activity of botanical supplements, it is important that health care and public health professionals understand their likelihood of botanical use.

Hispanic/Latino populations encompass people from diverse cultural traditions with differences in dialects, primary language, and traditions [7]. In some Hispanic/Latino populations, attitudes and beliefs about the use of botanical medicines are part of a cultural belief system transmitted through female relatives [7-11]. Surveys and interviews with Hispanic/Latino immigrants report a belief that botanical remedies are safer than prescription drugs and consistent with family traditions [11,12]. Medications are not eschewed, however; herbal teas are often consumed along with medications, especially among diabetics [8,13]. In fact, conventional medical care and physician’s advice may be highly valued [14]. However, herbal remedies may be chosen both because they are consistent with cultural practices and are cheaper and easier to obtain; one study, annual income was the strongest predictor of alternative medicine use (chiefly botanicals) [14]. In other studies, especially in areas of the country far from the US-Mexican border, botanical use may be less common because it is less available.

Unlike in the general population, factors related to botanical supplement use among Hispanics/Latinos are incompletely understood. Education appears either to play a limited role or a role that varies across degrees of acculturation [15,16]. Moreover, the operational definition of acculturation itself is variable. Most studies including acculturation as a covariate limit its definition to length of residence in the US and/or primary language [17,18], the latter possibly conflated with employment opportunity and income rather than Hispanic/Latino identity [14]. Some studies report higher prevalence estimates among recent immigrants [19-22], but others find no association between length of residence and the prevalence of botanical supplement use [14,17,23,24]. Moreover, a closer examination of the studies suggests that overall prevalence may not differ much by acculturation, regardless of its measurement, but by the types of botanicals used.

Objectives

The objective of this systematic review was to examine patterns in the prevalence of botanical supplement use among US Hispanics/ Latinos through a comprehensive examination of the biomedical literature. Specifically, we wished to answer the question: What studyrelated characteristics could be associated with higher prevalence estimates? A secondary objective was to quantify disclosure rates of botanical supplement use to health care providers within our sample of studies as well as to examine patterns in studies associated with those rates. Finally, because the specific botanical supplements used in Hispanic and Latino populations were reportedly different from the general population, we wished to document those differences.

Materials and Methods

Information sources

The senior author developed the study protocol, including the strategy for study identification: electronic database searches (CINAHL, EMBASE, Global Health, CAB Abstracts, AMED, and Medline) with keywords: herbal, herb, medicinal plant, botanical, dietary supplement, and Hispanic or Latino along with a manual search of retrieved references (Figure 1). The search included only citations published in the biomedical literature from 1998 until 2011, excluding dissertations, meeting abstracts, non-English publications, and studies outside the United States. The following studies met the protocol’s eligibility criteria:

epidemiology-Sample-database

Figure 1: Sample database search for systematic review of the prevalence of botanical supplement use among Hispanics and Latinos in the United States 1998-2011. The search of Medline/PubMed is presented. The original search was undertaken in 2011, but was updated 5/4/2012.

• Adult populations (age 18 and older);

• Adequate Hispanic/Latino sample, defined as n ≥10 and proportion ≥ 0.01;

• All quantitative data collection methods accepted (face-toface, telephone, and self-administered written questionnaires);

• Prevalence reported for botanical supplement use.

Data collection process

Two authors reviewed abstracts resulting from electronic database searches and identified studies meeting eligibility requirements. The two extracted information systematically with entry into a database file. A third author adjudicated any disagreements in data extraction. Outcomes collected included the following: 1) study sampling techniques (probability vs. convenience); 2) data source; 3) year of publication; 4) publication journal; 5) data collection type (face-toface interview, telephone interview, written survey); 6) language of study instruments (English, or English plus Spanish); 7) time period of the recall (e.g., use over the past 1-2 weeks, month, etc.); 8) location of study in the US (national, Mexican border, southeast, Midwest); 9) definition of botanical supplements in study (e.g., “herbal remedies” vs. “non-vitamin, non-mineral dietary supplements” vs. “biologicallybased therapies”); 10) sample population characteristics (age and gender distributions, education, insurance, US born, years in the US, and, where applicable, health conditions represented); 11) study size, including the size of the Hispanic/Latino sample population; 12) and commonly reported botanicals. In addition, the authors captured disclosure of botanical supplement use to health care providers.

To examine the impact of sample characteristics across studies, we limited the analysis to studies including a prevalence estimate of botanical supplement use among Hispanics/Latinos where Hispanics/ Latinos made up at least 1% of the sample with a sub-sample size of ≥10. Of the studies using the same dataset, we chose the study with the largest sample size. For example, if the study was based on the 2002 National Health Interview Survey (NHIS) sample, we used the report with estimates for the entire population rather than estimates for subgroups, such as older adults or patients with diabetes. We included only studies with a reasonably similar outcome, defining the prevalence of herb use, herbal medicine, herbal therapy, or “herbal and home remedies”. We excluded qualitative studies and those in which botanical supplement use for specific conditions was reported (rather than botanical supplement use among those with a particular condition).

Sources of bias

We evaluated sources of bias within studies, including recall bias, selection bias, and information bias, but made no attempt to restrict the sample of studies by any definition of study quality. To assess recall bias, we considered the recall period and target population (patients vs. general public). To evaluate selection bias, we examined the study sampling strategy, response rate, and target population. Finally, to gauge information bias, we considered the study instrument, both in terms of language and the specific botanicals included.

Summary measures and synthesis of results

Summary measures were limited to presentation of median prevalence statistics along with nonparametric bivariate tests (Mann Whitney U, Kruskal-Wallis). We calculated the median prevalence of botanical use (%) along with its binomial-based confidence interval for each stratum. Medians are reported to limit the influence of outliers. All analyses were conducted using Stata software Version 12 (Stata Corp LP, College Station, Texas 77845-4512). Stata employs confidence interval calculation methods based on a binomial distribution as described in Mood and Graybill [25].

To assess prevalence across studies controlling for recall, we stratified by the study instrument recall period: use over 1-2 weeks, 6 months to 1 year, and 2 or more years (including lifetime use). To examine sources of selection bias, we compared prevalence estimates according to the study’s sampling strategy (convenience vs. probability), the size of the study, and the proportion of Hispanics/Latinos in the sample. We also examined the target age (designed for older adults ≥65 years old vs. <65), the gender distribution (percent male) and the population target (patients vs. general population). Education and insurance data definitions varied too much to include in our analysis. We examined the influence of both the primary language of the study—categorized as English and Spanish vs. English alone and the representativeness of the study—regional vs. national. We classified type of publication as a complementary and alternative medicine (CAM) journal or a general biomedical journal. We examined the relationships among the study variables using a Spearman correlation procedure. Due to its public health and clinical relevance, we also captured disclosure of botanical supplement use to health care professionals among the studies we assessed. Finally, we examined the specific botanical supplements reported by Hispanics/Latinos across the studies qualifying for the review. We extracted the 10 most prevalent botanical supplements reported in each study and documented the number of studies in which they were reported.

Results

Study selection

Figure 2 portrays the search and selection process. After excluding studies without the appropriate population, language or outcome, 121 studies remained for more complete review. A review of study references yielded an additional 27. Six studies were excluded because of inadequate Hispanic/Latino sample size and another 9 studies lacked prevalence for Hispanics/Latinos. Twenty-three studies were excluded due to a duplicate data source. Of the remaining studies, 18 were qualitative, 15 reported the use of botanicals for treatment of a specific illness, and 22 reported the prevalence of all dietary supplements combined (Web Table 6). An additional 22 studies did not meet criteria for other reasons. References for and descriptions of excluded studies are provided in the Appendix.

epidemiology-selection-process

Figure 2: Search and selection process.

Study descriptions

Thirty-three studies of botanical use prevalence among Hispanics/ Latinos constituted the analysis sample, including studies inquiring about current botanical use—within the past 30 days or less — Table 1 [22,26-29], within the past 6-12 months — Tables 2a and 2b [6,24,29- 45], and use within 2 or more years — Table 3 [4,21,23,46-52]. Tables present data on study type (regional vs. national), sampling strategy (convenience vs. probability), target population, sample size (total and Hispanic/Latino), prevalence of botanical supplement use, botanical definitions, other variables collected in the study, study response rate, rate of disclosure of use of botanical supplements to physicians, and sample age range. Across the 32 studies, the total number of Hispanics/ Latinos was 18,316 with a total N across studies of 96,523. Study size ranged from 30 to 29,990 with Hispanic/Latino sample sizes of 11 to 3,599. More than half (53%) of the studies reported at least 500 subjects. Two-thirds of the studies included non-Hispanics, about half had a minority Hispanic/Latino sample, and 12% included fewer than 50 Hispanics/Latinos. Half of the studies were conducted within patient populations. Studies among patients included those with cancer [47], HIV [45], menopause [50], surgical patients [29,46], and pregnancy [42] as well as patients attending primary care clinics [21,23,24,41,51,52]. Regional studies included those from states along the Mexican border (Texas, New Mexico, Arizona, California: 50%) as well as in other parts of the country (Florida, New York, Massachusetts, Illinois: 28%). About a fourth of the study samples were representative of the national population. Twenty-two percent of studies were published in complementary and alternative medicine journals with the remainder in general biomedical journals. Information on exposures pertinent to prevalence estimates varied among studies: 59% collected data on income, 38% insurance, and 41% collected data on acculturation (birthplace or duration of US residence). The vast majority of studies (91%) collected education status, but categorization was inconsistent. Botanical supplement prevalence estimates among Hispanics/Latinos ranged from 4.7 to 80%.

First author, Year, Journal Study type, Sampling strategy, Target population N (H-L/Total) Prevalence (H-L/Total) Botanical- related outcomes Response Rate Disclosurea Age mean (SD), min-max
Kelly, 2006, J Alternative Complement Med [26] National survey (Slone), probability, US adults 1,109/13,436

15%/17%
Use of herbal/natural supplements in the past week 68% nr 18+24% >65
Loera, 2001, J Gerontology [22] National cohort study (EPESE), probability, Older Mexican Am. in southwestern US 2734 10% Use of folk medicine, herbs, herbal remedy over prior 2 weeks 83% nr 65+70% <75
Ness, 2005, Gerontologist [27] National survey (Health and Retirement Study), probability, Older adults 77/1099 12%/19% Current regular use of herbal supplements 79% nr nr 65+
Raji, 2005, Annals Pharmacother [28] Regional cohort: HPS (TX), probability, Older adults (>76) 128/365 5%/6% Use of herbal supplements in the past two weeks 61% nr 77+ majority>80
Rivera, 2005, Am Surgeon [29] Regional survey (TX), probability, Mexican-American surgical patients 115/115; 12 month: 62%; 30 days: 43% Use of herbal products past 12 months & 30 days 7.6% nr 48.6 19-81

Table 1: Studies assessing botanical supplement use in the past 7-30 days among US Hispanics/Latinos 1998-2011.

First author, Year, Journal Study type, Sampling strategy, Target population N (H-L/Total) Prevalence(H-L/Total) Botanical outcomes Response Rate Disclosurea (H-L/Total) Age mean (SD), min-max
Bair, 2008, Menopause [30] National cohort: SWAN, probability, middle-aged women 283/3295 9%/18% Herbal remedyuse in the past 12 months 70% complete data, nr 45.7, 42-52
Burge, 2002, Am J Pub Health [31] Regional survey (TX), convenience, family practice patients 460/575 27%/24% + 15%/14% used home remedies Herbal remedy use in the past 12 months 78%, nr/43% 43.8
Cherniack, 2004, Alt Comp Therap [32] Regional survey (NY), convenience, Primary care patients ≥60 27/209 37%/32% Use of herbs in the past 12 months nr 74.7
Fennell, 2004, Preventive Med [33] National survey: NHIS 2000, probability, US population 2,901/24,834 7%/15% Use of any mixed or single herb or botanical in the past 12 months 72% N nr/24% 18+ 42% <40
Gordon,2005,BMC Geriatrics [34] Regional survey (CA), probability, Older women in Northern CA 147/3,109 21%/25% Use of any herbal supplement past 12 months 72% nr 65-84
Graham,2005, J Nat Med Assoc [35] National survey: NHIS 2002, probability, US population 3,599/29,990 17%/19% Use of herbal medicine in past 12 months 73% 31%/40% 18+
Keegan,2000,J Holistic Nursing [36] Regional survey (TX), convenience, general public (grocery store) 60/120 52%/32% Use of herbal medicine in past 12 months nr 55%/27% 80+% under 50
Kronenberg,2006,Am J Public Health [37] Loera, 2007,Complement TherClinPract [38] National survey of CAM use, probability, US adult women 1,057/3,921 18%/15% Use of medicinal herbs and teas in the past year 79% (69% H-L) nr 18-50+ 83% of Hisp<50
Loera, 2007,Complement TherClinPract [38] National cohort study (EPESE), probability, Older Mexican Am. insouthwestern US 1445 28% Use of CAM/herbal medicine in the past 12 months 83% (1/2 sample censored) nr 71 (5.2)
Mackenzie,2003,Alt Ther Health Med [39] National survey(National Comparative Minor Health Care Survey), probability, US population 581/3452 23%/19% Use of herbal medicine over the past 12 months 60% nr
Ortiz,2006,J Am Pharm Assoc [40] Regional survey (FL), convenience, Hispanics in South Florida 142 74% Use of herbal supplements in past 12 months 71% nr 39 18-65+

Table 2a: Studies assessing botanical supplement use in the past 12 months among US Hispanics/Latinos.

First author, Year, Journal Study type, Sampling strategy, Target population N (H-L/Total) Prevalence (H-L/Total) Botanical outcomes Response Rate Disclosurea (H-L/Total) Age mean (SD), min-max
White,2009,J Am Board Family Medicine [24] Regional survey (CA), convenience, Low-income Hispanic/Latino clinic patients 164 63% Use of herbal/tea/plant-based substances in the past 12 months 100% nr nr
Zeilmann,2003,Pharmacother [41] Regional survey (NM), convenience, Geriatric clinic patients 84/186 61%/49% Use of herbal medicine in the past year >95% 28%/26% 65->85
Bercaw,2010, Birth Issues Perinatal Care (42) Regional survey (TX), convenience, Hispanic women, childbearing age 485 19% Herb use during pregnancy 90%, 66% 26.8 18-42
Ma,2011,BMC Cancer [43] Regional cohort study (CA), probability, Female breast cancer survivors <40 36/371 50%/59% Use of any of a list of herbal remedies in the past six months 50% At diagnosis: <35 to 40
Tsang,2007,Top Clin Nutrition [6] Regional survey (MA), convenience, Physically active adult members of ethnic minorities 11/106 18%/27% Botanical supplement use in the past 6 months nr 85% 18-65. 54% <35

Table 2b: Studies assessing botanical supplement use in the past 6-12 months among US Hispanics/Latinos.

First author, Year, Journal Study type, Sampling strategy, Target population N (H-L/Total) Prevalence (H-L/Total) Botanical- related outcomes Response Rate Disclosurea Age mean (SD), min-max
Adusumilli, 2008, Holistic Nursing [46] Regional survey (NY), Convenience, Patients presenting for surgery 270 / 2,186 37% / 38% Herbal medicine use in 2 years before surgery 65% nr/7% 18+
Greenlee, 2009, Breast Cancer Res Treat [47] Regional cohort baseline (CA), probability, Insured women with breast cancer 102/1,000 42%/47% Use of botanical supplements over five years since diagnosis 51%nr 50-75
Howell, 2006, J Am Family Medicine [21] Regional survey (IN), convenience, Hispanic family medicine patients 620 80% Use of herbal remedies ever nr 26% <20 to ≥ 40 (14% ≥ 40)
Jernewall, 2005, AIDS Care [48] Regional survey (NY, DC), convenience, HIV positive gay or bisexual H-L men 152 42% Use of plant-based CAM (herbs, home remedies) ever nr nr 39 29-69
Kuo, 2004BMC Complement Altern Med [23] Regional survey (TX), convenience, urban primary care patients 30/98 50%/36% Use (ever) of herbs or herbal products or natural medicines 98% nr <30 to >50 48% of Hisp>50
Lundy, 2001, Complement Health Pract Review [49] Regional survey (AZ), convenience, Low-income patients at family practice centers 386/516 35%/25% Use of special herbs over the past two years 83% 36% 33 (14) Hisp 43 (18) NHW
Mahady, 2003, Menopause [50] Regional survey (IL), convenience, Middle-aged women (40-60) attending clinics 59/500 75%/79% Use of botanical supplement use, including herbal teas (ever) 75% 30% 50.3 40-60
Mikhail, 2004, J Altern Complement Med [49] Regional survey, convenience, mix of Hispanic/Latino primary care patients and general population 179/179 36%/36% Use of herbs to treat disease 100% 21% 49 (16)
Trangmar, 2008, Annals Family Medicine [51] Regional survey (SC), convenience, family practice patients 70 67% Use of herbal medicines or teas ever nr nr 76% under 50
Zenk, 2001, Health Care Women Int [4] Regional survey (IL), convenience, Middle-aged Mexican American women 30 47% Use of herbal or natural remedies to help with symptoms or your health during midlife nr nr 40-56

Table 3: Studies assessing botanical supplement use in the past 2+ years among US Hispanics/Latinos.

Twenty-two studies reported a response rate. Of those, 23% reported a response rate less than 70%. Probability sampling was employed by only 41% of the studies. More than 40% of studies were available only in English and 34% of studies used data instruments directed to the general public, excluding botanicals common among Hispanics/Latinos, including specific questions about botanical teas

Summary prevalence estimates

Table 4 presents prevalence estimates for studies of botanical supplement use across a number of study variables. As expected, median prevalence estimates were higher for assessment periods of 6-12 months (27%) or 2 years or more (45%) as compared with ≤ 30 days (12%); many botanical supplements are consumed intermittently. Median prevalence estimates were higher in convenience (45%) vs. probability (21%) samples (Figure 3). In addition, regional studies reported higher prevalence estimates (42%) than nationally representative samples (15%). Sample characteristics associated with higher median prevalence of botanical use among Hispanics/Latinos included studies with: 1) patient populations (46 vs. 18%); 2) a focus on younger vs. older adults (42 vs. 12%); and 3) majority male vs. majority female samples (42 vs. 31%).

  Prevalence of use of botanical supplements
  n N Median 95% CI Pa
Overall 33 96,702 37 21, 49  
Time period
Over ≤30 days 5 17,749 12 4.7 , 43 0.02
Over 6-12 months 18 73,378 27 19 , 59  
Over 2+ years 10 5,575 45 36, 73  
Sample type
Probability 13 83,011 21 9.9, 42 0.01
Convenience 20 13,691 45 35, 63  
Data collection method
Interview 21 74,580 36 18, 56 0.6
Written 12 22,122 40 19, 52  
Publication type
CAM journal 8 19, 679 36 20, 51 0.8
General journal 25 77,023 42 18, 59  
Regional vs. national
Regional 26 16,675 42 35, 57 0.001
National 7 80,027 15 7.7, 22  
Sample populationa
General public 16 88,578 18 11, 37 0.003
Patients 16 7,945 46 37, 65  
Target age of population
Adults ≥65 7 9,147 21 6.3, 53 0.07
Adults <65 26 87,555 42 24, 51  
Gender distribution
Majority males 5 4,250 42 23, 50 0.5
Majority females 26 92,168 31 18, 49  
Language of instrument
Spanish & English 20 16,880 42 29, 63 0.02
English only 13 79,822 18 9.9, 45  
Sample proportion of H-L
Majority H-L 16 8,321 45 32, 67 0.02
Minority H-L 17 88,381 21 15, 42  
Size of H-L sample
N < 250 18 8,239 45 37, 58 0.08
N ≥ 250 15 88,463 23 15, 37  
Botanicals common among H-L
No 11 82,716 18 11, 37 0.003
Yes 22 13,986 49 35, 63  

Table 4: Prevalence of the use of botanical supplements in studies including Hispanics/Latinos 1998-2011 across characteristics of included studies.

epidemiology-botanical-supplement

Figure 3: Prevalence of botanical supplement use among Hispanics/Latinos by sample characteristics.

Studies with a majority Hispanic/Latino sample population reported a median prevalence of 45% (vs. 21%). Studies including botanicals common in Hispanic/Latino populations, such as botanical teas, reported higher median prevalence estimates than those focusing on botanical supplements common in the general population (49% vs. 18%). Studies conducted only in English yielded a median prevalence of 18% while those conducted in Spanish and English had a median prevalence of 42%.

Variability in the estimates was high with wide binomial confidence intervals around the medians. In addition, because of considerable overlap in the categories and the small number of studies considered, the independent contributions of study and sample characteristics could not be determined. For example, studies with probability samples were likely to be designed for the national population, in English, with a minority Hispanic/Latino population, and inquiries about botanicals common to the general population, whereas convenience samples were more often conducted in a regional locale with study instruments designed for the local population.

Disclosure to Health Care Providers

Eight of the included studies provided information on disclosure of botanical supplement use to health care providers for the Hispanics/ Latinos and non-Hispanics and 10 studies reported disclosure rates specifically for Hispanics/Latinos. For Hispanics/Latinos, disclosure rates ranged from 8 to 66% with a mean of 31% and median of 30. For studies including Hispanic/Latino and non-Hispanics, disclosure rates ranged from 7 to 53% with a mean of 34 and median of 37. Interestingly, differences in disclosure rates between studies among patients and those in non-patient populations were not large: median 32% (95% CI: 14, 48) vs. 40% (95% CI: 17, 40). Studies that asked about disclosure of other complementary therapies (e.g., acupuncture, massage, meditation) in addition to botanicals reported higher rates of disclosure to physicians (37%; 95% CI: 24, 50), compared with studies that focused solely on botanicals (23% ; 95% CI: 7.1, 33) (p=0.15).

Common botanical supplements among Hispanics/Latinos

Ten of the studies reported the most common botanical supplements among Hispanics/Latinos (Table 5). These included chamomile, aloe, mint, and garlic [14,21,29,40,45,49]. It should be noted that, unlike consumption of botanical supplements in the general population, these botanicals are often consumed in teas or other raw forms. Note that other botanicals on the list are unusual in the general population as well, e.g., lime tree (linden), prickly pear cactus (nopal), and corn silk.

English name Spanish name Number of studies reporting
Garlic Ajo 11
Chamomile Manzanilla 11
Aloe vera Savila 9
Ginseng Ginseng 5
Mints Yerba Buena 5
Oregano Oregano 5
Lime Tree (Linden) Tilo, Flor de Tila 4
Prickly pear cactus Nopal 4
Ginger Jengibre 3
Wormwood Ajenjo 3
Mullein Gordolobo 3
Eucalyptus Eucalipto 3
Cinnamon Canela 3
Star anise Anisestrella 2
Corn silk Pelo de Elote 2

Table 5: Most common among Hispanic/Latino populations in the United States.

Discussion

This unique comprehensive systematic review explores study characteristics associated with variations in the prevalence of botanical supplement use among Hispanics/Latinos. As we expected, we noted differences in prevalence related to the proportion of Hispanics/ Latinos in the sample population, the sampling strategy, and sample characteristics. In regional samples, potentially biased by the sampling strategy, prevalence estimates were almost three times as high as in nationally-representative population surveys. However, in nationallyrepresentative samples, ethnic minorities, especially recent immigrants, may be under-represented (40). For example, among studies of individuals along the Mexican border over a 6-12 month recall period, prevalence estimates of botanical supplement use range from 19 to 78% [24,29,31,34,36,38,41,44,45]. In contrast, prevalence estimates among Hispanics/Latinos in nationally-representative samples over a similar time period ranged from 7 to 23% [30,33,35,37,39]. Not surprisingly, because the language used to describe botanicals among Hispanics/ Latinos differs from that of the general US public (including plant names, product formulations, and typical use patterns), assessment instruments designed for Hispanic/Latino populations produce higher prevalence estimates than those created for national samples. In some studies, supplement definitions consisted of commercial products only [26,35,39]; in others, information on any botanical substance (including herbal teas) used to prevent or treat a disease or illness was solicited [22,24,29,37,44-45,50,51]. As teas are commonly consumed in many Hispanic/Latino populations [52], botanical assessments that exclude them may result in serious underestimates. Among the studies of botanical supplement use in the past 6-12 months with instruments that target botanical supplements common among Hispanics/Latinos, prevalence of use among Hispanics/Latinos ranged from 18 to 80 %, median 50% [24,29,31,36-38,41,44,45,49] while among those that do not target Hispanic/Latino botanical supplements, the range was 7 to 42%, median 18% [6,30,33-35,39,43].

We identified a number of sources of bias in the studies. Studies based on national probability samples were either hampered by an overall poor response rate [35], did not report a response rate [33], or had a differential, lower response rate for Hispanics/Latinos [37]. In addition, studies utilizing the NHIS, with data collection by census staff, may have excluded certain Hispanic/Latino populations, such as recent or undocumented immigrants. Other probability samples used sampling frames biased toward individuals with higher incomes. For example, an otherwise excellent study limited its sample to older women covered by a particular health plan [47]. Similarly, studies that utilized telephone surveys excluded those without telephones [39]. Studies using cohort follow-up samples [30,38] may have suffered from bias due to differential loss to follow up. Many convenience studies were likely to have been biased by differential non-response: nonusers of botanical supplement may have been less likely to respond. Some of the best studies with convenience samples, with close to 100% response rates were difficult to compare, due to differences in their target populations. One study was undertaken in a low-income clinic [24] and another among patients presenting for surgery [29].

Other potential sources of bias included recall and information bias. The majority of the studies asked respondents to recall their use of botanical supplements over a period of several months. It is unclear whether or not respondent characteristics, such as poor health [38] or adverse pregnancy outcomes [42] may have affected recall.

Variable botanical supplement definitions also affected prevalence estimates. Although we excluded studies of non-botanical dietary supplements from our final analysis, we cannot be certain that questions about “herbal products” [44] and “herbal remedies” [31] are the same.

In the general public, botanical supplement use is more prevalent among women and those with chronic conditions [3,53]. National studies have also predicted higher use of botanical supplement among older Hispanics/Latinos as compared with non-Hispanic whites [54]. However, among Hispanics/Latinos in the selected samples, botanical supplement use in studies targeting older adults was somewhat lower than studies targeting all adults or studies targeting middle-aged adults. In our sample of studies, we documented higher prevalence among patient populations, but studies with predominantly female populations did not have higher prevalence estimates

The language of the study instrument had an impact on estimates. Not only did studies offered only in English exclude those who are less proficient in English, they also may have resulted in prevalence underestimates. In one study, most of the respondents did not know the English name for over 90% of the herbal products in the study [21]. Regional studies, even those with probability sampling, reported much higher prevalence estimates than national studies. The differentials are likely to be due to a combination of factors, including non-response bias in the convenience samples and exclusion of botanicals common among Hispanics/Latinos in the national samples

Hispanic/Latino patient’s rates of disclosure of botanical supplement use to physicians are low [21]. In the general population, a third to half of supplement users discloses their use to health care providers [55,56]. Despite an expectation that disclosure rates would be substantially lower among Hispanics/Latinos, due to language and access challenges [40], in the studies reported in this review, disclosure levels among Hispanics/Latinos (median 30%) were only slightly lower than those reported in previous studies. Across studies, >60% of individuals reported that they do not tell their health care provider about taking botanical supplements. Moreover, in a chart review, only 15% of botanical supplement use was documented in the medical record [13]. The lack of disclosure could put individuals at risk of adverse events related to botanical supplements or their interactions with prescription medications.

Our finding that disclosure rates were higher for studies targeting, and asking about disclosure of any complementary therapy as compared with botanical supplement studies suggests that individuals are even less likely to disclose use of botanicals than other complementary therapies. This finding merits further investigation as it has important implications for both clinical practice and public health assessments.

Taken together, these findings suggest that botanical use among Hispanics/Latinos is underestimated both in the biomedical literature and by healthcare providers. Botanical use is often a cultural practice [40], occupying a space outside the biomedical milieu. Accurate assessment of botanical use depends on careful inquiries about the use of not only dietary supplements, herbal products, and home remedies, in Spanish where appropriate, but also about special foods and teas as well as personal and family health practices. Anecdotally, Hispanics/Latinos may not think of herbal teas as herbal remedies or therapies, even when specifically taken for treatment of a minor illness (e.g. mint for upset stomach, linden for nervousness/insomnia, aloe for constipation) or for prevention of disease (nopal for diabetes prevention).

Limitations

This systematic review is limited in important ways. Variability in outcome definitions and recall periods make cross-study comparisons difficult—reported median prevalence estimates should be considered approximations. Biases, as described earlier, may also have enormous impacts on estimates. Moreover, available studies have insufficient information to determine if variations in prevalence are associated with differences in Hispanic/Latino background; for example, individuals from Puerto Rico may have very different use patterns than those from Mexico.

Although we made every effort to retrieve all studies reporting prevalence of botanical supplements among Hispanics/Latinos in the biomedical literature, we may have missed those not listed within the databases we searched. In addition, studies not published in the literature would be excluded.

Conclusions

Despite the limitations, this systematic review provides a unique, comprehensive examination of botanical supplement prevalence among Hispanics/Latinos, using all available data. Although the prevalence estimates are highly variable, clear patterns emerged. Of particular interest are the differences in prevalence associated with variables related to Hispanic/Latino ethnicity such as the proportion Hispanics/ Latinos in the sample and the inclusion of botanicals common in the population. Studies directed toward non-Hispanic/Latino samples with inquiries in English only and inquiries regarding botanicals common in the general population only, may undercount botanical supplement use among Hispanics/Latinos. Additional prevalence studies in large Hispanic/Latino populations, with adequate data on Hispanic/Latino background are needed to address lingering uncertainties.

References

Select your language of interest to view the total content in your interested language
Post your comment

Share This Article

Relevant Topics

Article Usage

  • Total views: 12390
  • [From(publication date):
    September-2015 - Sep 20, 2019]
  • Breakdown by view type
  • HTML page views : 8590
  • PDF downloads : 3800
Top