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Table 4 Association of asthma severity with ADRB2 polymorphisms [Arg16Gly (c.46A > G) and Gln27Glu (c.79C > G)]

From: Asthma: Gln27Glu and Arg16Gly polymorphisms of the beta2-adrenergic receptor gene as risk factors

Severity

Arg16Gly (c.46A > G) polymorphism

χ2

p-value

Arg16Arg

OR (95% CI)

Arg16Gly

OR (95% CI)

Gly16Gly

OR (95% CI)

Total

Severe

14 (37.8%)

1.258 (0.508 - 3.114)

3 (8.1%)

0.25 (0.064 - 0.966)

20 (54.1%)

1.672 (0.698 - 4.003)

37 (100%)

4.674

0.322

Moderate

7(33.3%)

0.909 (0.319 - 2.587)

5 (23.8%)

1.625 (0.484 - 5.454)

9 (42.9%)

0.703 (0.259 - 1.906)

21 (100%)

Mild

8 (32%)

0.829 (0.306 - 2.246)

7 (28%)

2.431 (0.771 - 7.665)

10 (40%)

0.667 (0.258 - 1.726)

25 (100%)

 

Gln27Glu (c.79C > G) polymorphism

  

Gln27Gln

OR (95% CI)

Gln27Glu

OR (95% CI)

Glu27Glu

OR (95% CI)

Total

Severe

25 (67.6%)

2.708 (1.099 - 6.674)

3 (8.1%)

0.182 (0.048 - 0.691)

9 (24.3%)

1.023 (0.372 - 2.812)

37 (100%)

8.285

0.082

Moderate

10 (47.6%)

0.701 (0.26 - 1.892)

6 (28.6%)

1.667 (0.534 - 5.197)

5 (23.8%)

0.979 (0.307 - 3.124)

21 (100%)

Mild

10 (40%)

0.438 (0.168 - 1.141)

9 (36%)

3.063 (1.037 - 9.041)

6 (24%)

0.9925 (0.331 - 2.973)

25 (100%)

 

Arg16Gly (c.46A > G) and Gln27Glu (c.79C > G) polymorphisms in combination*

  

0

OR (95% CI)

1

OR (95% CI)

2

OR (95% CI)

Total

  

Severe

12 (32.4%)

0.571 (0.232 - 1.406)

21 (56.8%)

1.706 (0.712 - 4.086)

4 (10.8%)

0.994 (0.247 - 4)

37 (100%)

1.908

0.753

Moderate

9 (42.9%)

1.188 (0.435 - 3.241)

10 (47.6%)

0.909 (0.338 - 2.448)

2 (9.5%)

0.827 (0.158 - 4.331)

21 (100%)

Mild

12 (48%)

1.626 (0.629 - 4.205)

10 (40%)

0.581 (0.224 - 1.504)

3 (12%)

1.182 (0.271 - 5.154)

25 (100%)

  1. ADRB2 = alpha2-adrenergic receptor; Arg = arginine; Gly = Glycine; Gln = Glutamine; Glu = Glutamic acid; A = Adenine; G = Guanine; T = Thymine; OR = Odds Ratio; CI = Confidence Interval.
  2. *The groups were created by counting each homozygous guanine allele at the Arg16Gly (c.46A > G) and Gln27Glu (c.79C > G) polymorphisms: (0) Arg16Arg + Gln27Gln genotype combination; (1) Gly16Gly or Glu27Glu genotype presence; (2) Gly16Gly + Glu27Glu genotype combination.
  3. The OR was calculated using the Open-Epi tool (http://www.openepi.com). The OR and 95% CI values were obtained using the Mild-P test and in the table the χ2 value is shown. For all data analyzed, α = 0.05 was used. The significant p-values are in bold.