Forest plot showing the comparisons of FEV
%predicted between different rs1051730 genotypes. A: GA versus GG; B. AA versus GG. The circles in squares and the horizontal lines represent the mean difference and 95% CI, respectively, for each included study; the diamond shape represents the pooled mean difference and 95% CI. FEV1, forced expired volume in 1 second; CI, confidence interval; df, degree of freedom.