Control

Asthma

COPD

 

No

%

No

%

No

%

Genotype

 

 

 

 

 

 

CC

11

18.3

26

52.0

15

37.5

CT

40

66.7

22

44.0

21

52.5

TT

9

15.0

2

4.0

4

10.0

χ2 (p)

 

 

14.976*(0.001)

4.642 (0.098)

 

 

 

 

 

Allele frequency

 

 

 

 

 

 

C

51

51.0

48

52.2

36

59.0

T

49

49.0

44

47.8

25

41.0

χ2 (p)

 

0.026 (0.871)

0.980 (0.322)

χ2: Chi square test between control and other groups. *: Statistical significance at p ≤ 0.05
Table 2: The genotype and allele frequencies of CD40 − 1C/T among the three studied groups.