Before matching

                   After matching

Characteristics

Asthma(n=2525)

Non-asthma(n=21700)

         
p value

   Asthma(n=2257)

Non-asthma(n=2257)

p value

Demographics

Mean age

33.697

37.647

0.0001

36.898

35.483

0.0329†

Males (%)

41.82

46.16

0.0001

39.83

38.86

0.5027

Race (%):

0.0001

0.0087†

White

68.83

76.66

70.14

71.87

Black

23.33

15.57

22.33

20.25

American Indians

0.87

0.87

0.84

0.84

Asians

2.81

4.46

2.84

4.39

Native Hawaiian

0.48

0.34

0.49

0.4

Multiple Races

3.68

2.1

3.37

2.26

Hispanics (%)

18.97

23.18

0.0001

18.25

17.59

0.5605

Region (%)

0.0006

0.0444†

Northeast

16.91

14.57

17.24

14.98

Midwest

20.88

21.73

21.27

24.24

South

38.58

37.18

37.66

37.44

West

23.63

26.52

23.84

23.35

Area –MSA (%)

83.41

82.97

0.5715

83.61

82.19

0.2059

Education

n/a

n/a

0.0001

0.7921

Poverty categories (%)

0.0001

0.3659

Poor/Negative

27.37

17.97

25.48

23.84

Near poor

5.39

5.91

5.23

6.34

Low income

16.71

15.45

16.57

16.3

Middle Income

27.01

29.35

27.65

27.29

High Income

23.52

31.33

25.08

26.23

CCI

0.5339

0.4122

0.0001

0.576

0.4843

0.0142†

Insurance Coverage (%)

0.0001

0.0001†

Any Private

50.85

60.11

52.55

57.86

Public Only

40.2

26.65

37.93

29.33

Uninsured

8.95

13.24

9.53

12.8

† Variables those were significant even after applying matching algorithm, CCI-Charlson comorbidity index, and MSA-Metropolitan statistical area
Table 1: Demographic and comorbidity characteristics of asthma and non-asthma cohorts before and after matching.
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