Table III.

Combined analysis after excluding sources of between-study heterogeneity.

				Heterogeneity
Genetic model	Excluded studies (refs.)	OR (95% CI)	PZ	PQ	I2 (%)
C vs. G	Pereira et al (16) and Armendariz-Borunda et al (18)	1.06 (0.73–1.54)	0.76	0.81	0.0
GC vs. GG	Pereira et al (16) and Armendariz-Borunda et al (18)	1.06 (0.70–1.61)	0.78	0.80	0.0
CC+GC vs. GG	Pereira et al (16) and Armendariz-Borunda et al (18)	1.06 (0.71–1.59)	0.77	0.81	0.0

OR, odds ratio; 95% CI, 95% confidence interval; P_Z, P-value of Z test; P_Q, P-value of Cochran’s Q statistic; I², value of I² statistic.