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Table 1 Genotype distributions and allele frequencies of four HNMT polymorphisms and one ABP1 polymorphism for asthmatic patients versus control group (figures in parentheses indicate percentages)

From: Polymorphisms of two histamine-metabolizing enzymes genes and childhood allergic asthma: a case control study

Gene

Polymorphism

Asthma

Control

P value

 

1637

  

N = 139

N = 137

0.352

  

genotypes

TT

38 (27.3)

41 (29.9)

 
   

CT

75 (53.9)

79 (57.7)

 
   

CC

26 (18.8)

17 (12.4)

 
  

alelles

T

151 (54.3)

161 (58.7)

0.303

   

C

127 (45.7)

113 (41.3)

 
 

314

  

N = 149

N = 147

0.042*

  

genotypes

CC

99 (66.4)

119 (80.9)

 
   

CT

43 (28.9)

26 (17.7)

 
   

TT

7 (4.7)

2 (1.4)

 
  

alelles

C

241 (80.9)

264 (89.8)

0.048*

   

T

45 (19.1)

30 (10.2)

 

HNMT

411

  

N = 146

N = 156

0.720

  

genotypes

TT

7 (4.8)

5 (3.2)

 
   

CT

43 (29.4)

50 (32.1)

 
   

CC

96 (65.8)

101 (64.7)

 
  

alelles

T

57 (19.5)

60 (19.2)

1.000

   

C

235 (80.5)

252 (80.8)

 
 

1097

  

N = 146

N = 156

0.977

  

genotypes

CC

90 (61.6)

95 (60.9)

 
   

CG

51 (34.9)

55 (35.3)

 
   

GG

5 (3.4)

6 (3.8)

 
  

alelles

C

231 (79.1)

245 (78.5)

0.920

   

G

61 (20.9)

67 (21.5)

 

ABP1

His645Asp

  

N = 146

N = 156

0.530

  

genotypes

TT

75 (51.4)

79 (54.1)

 
   

AT

52 (35.6)

54 (37.0)

 
   

AA

19 (13.0)

13 (8.9)

 
  

alelles

T

202 (69.2)

212 (72.6)

0.412

   

A

90 (30.8)

80 (27.4)

 
  1. * indicates significance: χ2 = 6.302, df = 2