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Trends in Age Distributions, Complications, Hospital Stay, and Cost Incurred in a Chinese Diabetic Population from 2006 to 2013 | OMICS International
ISSN: 1948-593X
Journal of Bioanalysis & Biomedicine

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Trends in Age Distributions, Complications, Hospital Stay, and Cost Incurred in a Chinese Diabetic Population from 2006 to 2013

Zuolei Dai, Xin Zhang, Hongwei Shan and Yun Liu*

The First Affiliated Hospital of Nanjing Medical University, Nanjing 210029, China

*Corresponding Author:
Yun Liu
Department of Information
The First Affiliated Hospital of Nanjing Medical University
Nanjing 210029, China
Tel: 86-25-83781379
E-mail: [email protected]

Received Date: February 11, 2015; Accepted Date: April 06, 2015; Published Date: April 10, 2015

Citation: Dai Z, Zhang X, Shan H, Liu Y (2015) Trends in Age Distributions, Complications, Hospital Stay, and Cost Incurred in a Chinese Diabetic Population from 2006 to 2013. J Bioanal Biomed 7:050-053. doi:10.4172/1948-593X.1000123

Copyright: © 2015 Dai Z, 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.

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Diabetes is becoming a major chronic disease which affects human health. The diabetic data in hospital of large amount contains much information. Here we analyzed the in hospital diabetes’s data and hope to provide basic data and scientific basis for the control of diabetes and the decrease of economic burden of diabetics in China. Mathematic statistical methods were made to the in hospital diabetics’ data. Retrospective analysis was made to the age, gender, days in hospital, cost and complications. The result shows that more and more young people have diabetes, and the number of diabetics is growing. The average days in hospital of diabetics is increasing along with age. Average number of complications is 3.108. Hospital costs are getting higher along with the number of complications. The average days in hospital decreases from 14.15 in 2006 to 10.61 in 2013. Hospital costs presented an increasing trend, so does daily hospital costs. This study resulted in a fact that age, gender, days in hospital, cost and complication of diabetics has impacts on each other. Cost is directly influenced by the number of complications and the days in hospital. People in China should pay attention to the prevention of diabetes, and diabetics should follow the doctor’s advice to control blood sugar to normal state.


Diabetes; Inpatient data; Analysis; Prevention


The prevalence of chronic diseases has been rising since 1980s as people’s living standard gets higher and the pace of modern life gets faster. Chronic diseases have become a major threat to people’s health, accounting for 80% of the death toll [1]. Diabetes is the most common metabolic diseases. Its incidence has been increasing over the past decades [2]. In 2013, the rate of diabetes has been up to 9.6% in China and 9% all over the world. Studies show that the prevalence rate of diabetes in China will reach 13% by the year 2035 [3-5]. Diabetes has become an important factor that endangers human health. Medical cost and labor loss caused by diabetes have laid enormous economic burden on the patients [6-8]. Cost on diabetes accounts for about 13% of the cost on health service in China while 5%-6% in developed countries. The direct cost for type 2 diabetes in China in 2007 is about 26 billion US dollars and will reach 47.2 billion US dollars in 2030 [9]. Therefore, under the condition of the increasing rate of diabetes, the mechanism of follow-up survey on diabetics should be set up in China, in which includes the statistics on the amount of cost on health and fully implementation of perfect survey on health economics. This research collected the clinical data of in hospital diabetics in the First Affiliated Hospital of Nanjing Medical University and analyzed the basic situation of diabetes. The exploration of the changes and the analysis of the reasons provide scientific basis for the clinical treatment and hospital management. They also offer the references for the prevention of local diseases and health service in China.


The data we used is directly extracted from in hospital records. All the patients this research studied is hospitalized patients. Using principal diagnoses of hospitalized patients, diseases cases are selected to establish a database. By counting the times of patients be in hospital for diabetics, we gained the percentage of times of diabetics out of the whole inpatients. Gender distribution is gained by counting gender of diabetics. Using the same method, age distribution in different groups comes out. In hospital days and hospital costs are calculated, so as to get daily costs on average. Through the combination with the age distribution, we got the distribution of in hospital days in different age groups. According to the data of other diagnosis, we got the situation of diabetic complications. We also analyzed the mean number of complications of diabetics.


General review

During the years from 2006 to 2013, there were 531,718 in hospital patients, in which males accounted for 49.36% and females for 50.64%. The number of diabetics was 12,214, accounting for 2.30% of the total in hospital patients. Of all the 12,214 diabetics, 57.30% were males and 42.70% were females.

Age analysis

We divided the diabetics into five groups by every 20 years old. Age distribution of diabetics in different age-groups shows as Figure 1. All the five groups show an increasing trend. Diabetics between 41 and 80 years old occupied over 80% of the whole diabetics in all the eight years. Chi-square test is used on the number of 1-20 years old diabetics and over 20 years old diabetics. The result shows there is significant difference (p<0.001) between the numbers of the two groups of diabetics. The number of 1-20 years old group has faster average growth in the eight years, which is 25.34%, than the over 20 years old group, which is 14.52%.


Figure 1: Age distribution of diabetics from 2006 to 2013.
Horizontal axis represents the years from 2006 to 2013. Vertical axis represents the proportion of diabetics in each year. Different colors represent different age-groups.

Hospital stay analysis

Hospital stay (days patient stay in hospital) of diabetics in different age-groups shows as Figure 2a. The in hospital days of diabetics in different age groups are counted. The number of diabetics in hospital for 8 days is the largest. Most patients (81.83%) tend to stay in hospital for 4 to 16 days. Diabetics between 41-60 years old have the longest hospital stay.


Figure 2a: In hospital, days distribution of diabetics in different age groups. Horizontal axis represents in hospital days, days more than 30 are merged into one group called “>31”. Vertical axis represents the number of diabetics of each in hospital day. Different color lines represent different age groups.

Average hospital stay of diabetics in different age groups is generated by dividing the total days by the number of total diabetics of different age groups and is shown as Figure 2b. Mean hospital stay increases with age, especially for the diabetics of 81-100 years old. Meanwhile, we noted that in hospital days of diabetics of 1-10 years old (9.8 days) are more than one day longer than those of 11-20 years old (8.1 days).


Figure 2b: Average in hospital days of diabetics in different age groups. Horizontal axis represents different age-groups. Vertical axis represents mean hospital stay. Error bars are marked with standard deviation.

Cost analysis

We analyzed the total cost on diabetes and total diabetics number of each year form 2006 to 2013. In hospital costs of diabetics in different age group shows as Figure 3a. Diabetics between 81-100 years old have the most in hospital cost, nearly half of the whole diabetics’ cost of each year. In hospital costs of diabetics under 80 years old shows an increasing trend, although there is a fluctuation in both 2011 and 2013.


Figure 3a: Hospital cost of diabetics in different age groups. Horizontal axis represents the years from 2006 to 2013. Relatively, the proportion of in hospital days of diabetics is represented by vertical axis in different age groups. Different colors represent different age-groups.

By analyzing in hospital days and cost we get the average hospital cost of diabetics per day which is shown in Figure 3b. The cost of each diabetic is 508 RMB per day in 2006, and increases year by year to 930 RMB per day in 2013. The average growth of cost in the eight years is 9.02%.


Figure 3b: Average hospital cost of diabetics per day. Horizontal axis represents the years from 2006 to 2013. Vertical axis represents the mean hospital cost per day. Error bars are marked with standard deviation. The cost of each patient is quite different, so the standard deviation is very large.


To see how complications influence costs incurred, we analyzed the complications of diabetics. The number of other diagnostic data shows as Table 1. In all 12,214 cases of hospitalized patients, there are 10,086 patients who have complications, accounting for 82.58%, most of which (3,039 cases) have one complication, accounting for 24.88%. The number of complications of all patients is 37,968, averaging 3.108 complications per patient. Table 2 lists the most 9 complications.

Complication number Patient number
0 2,128
1 3,039
2 2,580
3 1,846
4 1,145
5 1,418
6 58

Table 1: Complication number of diabetics.

Diagnosis percent count
diabetic neuropathy 24.26% 769
 diabetic nephropathy 17.54% 556
diabetic eye disease 16.18% 513
 diabetic ketoacidosis 11.58% 367
 diabetic pedipathy 8.52% 270
 hyperlipidemia 6.75% 214
 fatty liver 6.62% 210
 diabetic ketoacidosis 6.25% 198
 diabetic peripheral vascular lesions 2.30% 73

Table 2: Statistic of diabetic complication.

Daily hospital costs show as Figure 4. Diabetes without complications spends 5,866.6 RMB on average. However, diabetics with four complications spend up to 11,178.0 RMB on average, which increases to 1.9 times compare with the former. It is obvious that along with the increase of complication number, hospital costs are getting higher.


Figure 4: Average cost of diabetics with different number of complications. The numbers of complications is represented by horizontal axis while the daily hospital costs are represented by vertical axis. Error bars are marked with standard deviation.

We also analyzed comorbidity of diabetics (complication that is not caused by diabetes). Table 3 lists the most 9 comorbidities. We can see that common cardio-cerebrovascular diseases are the main comorbidities.

complication percent count
Hypertension 73.78% 3233
infarction 7.51% 329
 coronary heart disease 6.16% 270
 Thyroid dysfunction 4.54% 199
 cataract 2.26% 99
 urinary tract infection 1.96% 86
 pulmonary infection 1.32% 58
adiposity 1.30% 57
 osteoporosis 1.16% 51

Table 3: Statistic of diabetic comorbidity.

Analysis by year

The patient information and hospital cost in different years shows as Table 4. The in hospital days decreased from 14.15 in 2006 to 10.61 in 2013. Hospital cost presented an increasing trend from 2006 to 2009 and decreased from 2009 to 2013. These are related with better health service, rich medicine and better management on daily hospitalization.

Year Average age Average days in  hospital Average cost (yuan) Cost per day (yuan)
2006 57.6 14.1 7,192.4 488.9
2007 57.3 13.7 6,545.1 499.9
2008 57.0 13.0 7,028.9 563.0
2009 58.3 14.45 11,694.4 724.3
2010 57.5 14.3 10,915.8 762.3
2011 57.0 12.6 8,975.8 725.13
2012 56.6 12.0 9,861.5 915.5
2013 56.5 10.6 9,872.5 1,073.3
Average 57.2 13.1 9,010.8 719.0

Table 4: Analysis in different years.


From the analysis above we can see that in China although aged people tend to have higher rates of diabetes [10], the incidence of diabetes in the young people (1-20 years old) is increasing faster (p<0.001) (Figure 1) than other people (over 20 years old). The rate of people with diabetes under 40 years old is getting higher, which is closely related to the unhealthy lifestyle of modern people. It could be the reason by fast life pace, high life pressure, lack of sleep and sports exercise and unhealthy diets. So, residents should pay attention to their own health and the change of blood glucose, strengthen sports exercises, control their diet, and stay far away from diabetes and impaired fasting glucose. As for people with diabetes, they should pay more attention to their dietary structure and do more sports exercise, control blood sugar level and keep in a stable condition.

For diabetes, the days of staying in hospital and hospitalization costs have direct relation to the age. The elder the diabetics are, the more days and costs in hospital. With the basic disease and the decreasing of immune ability in elder patients the number of complications and mean hospitalization cost increased. Average cost in hospital of diabetics with four complications is 11178.0 RMB, which is 1.9 times of diabetics without complication. Therefore, elder diabetics should pay attention to physical changes, effectively control blood glucose and stabilize illness condition. In a sense, it can alleviate the economic burden by decreasing the time in hospital.

Meanwhile, hospital stay and cost of diabetics also have close relation to the number of complications. Our results showed that diabetics without complications spend less in hospital than those with complications on things such as medicine, assay, and inspection. The more complications they have and the later complications are discovered, the longer diabetics stay in hospital. In the wake of all other increasing cost such as bed and medicine, hospital stay increases unavoidably. From the above, hospital cost can be effectively controlled by controlling on the number of the complications, so does the economic burden.

In the research data, for the first other diagnosis, common cardiocerebrovascular diseases have 3,928 cases, such as hypertension, hyperlipidemia, fatty liver, coronary heart disease and cerebral thrombosis. It is obvious that common cardio-cerebrovascular diseases are the main comorbidities; in which hypertension have 3,233 cases, accounting for 87.43%. The previous study showed that hypertension has serious impact on the happening and developing of diabetic complications [11]. For the diabetics with hypertension, if hypertension cannot be well controlled, the diabetes can’t be either. If hypertension can be well taken care of, hospitalization cost would be greatly lowered.

It can be seen from Table 4 that the average days in hospital decreases while average hospital costs and daily hospital costs increasing. It shows that average time spend on cure is shortened with the improvement in health care, more medicines, and closer hospital management. But in terms of the increasing in costs in hospital, it is clear that government should take various positive measures, including effectively controlling medical prices and alleviating economic burden on diabetics to improve people’s health.


Diabetes has become one of the major diseases that bothered residents’ health and caused economic burden [12]. In view of the serious damages brought by diabetes, it should be given high priority by health policy makers, health workers and diabetics in China. Since heredity, diet, obesity, lack of physical exercise and anxiety are factors for diabetes, International Diabetes Federation comes up with best solution from five aspects. The solution involves diet, medicines, tests, physical exercise and physiological treatment and care. Diabetes and high risk groups start from little aspects, by positive prevention and treatment on diabetes and complications. Meanwhile, policy-making sectors should timely make out effective manage policy and control the incidences of diabetes from the development of diabetes, so as to improve the quality of residents’ life and lower economic burden on people with diabetes [13].


This work was supported by grants from the National Natural Science Foundation of China (grant numbers 81270952 and 81070684), the Jiangsu Province’s Key Provincial Talents Program (BE 2011802), the Projects in the Jiangsu Science and Technology Pillar Program (BE 2011802), the Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions, the Program for Development of Innovative Research Team in the First Affiliated Hospital of NJMU (number 20113012), and the Special Scientific Research Project from the Ministry of Health, China (grant number 201002002). Nanjing Medical University Science and Technology Development Foundation (2012NJMU122).


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