Table 3. Comparison of different genetic models for -308G/A polymorphism and OSAHS risk in subgroups.

Subgroup analysis	No of studies	No of cases	No of controls	I2	PQ	ORG (95% CI)
All model-free	7	1291	993	15.6	0.31	1.84(1.47–2.32)
All in HWE	6	1187	890	14.6	0.32	1.77(1.40–2.25)
Caucasian	3	425	586	0.0	0.52	1.83(1.42–2.35)
Asian	4	866	407	48.2	0.12	1.92(1.18–3.13)
						1.86(1.18–2.94)*
All allele	7	1291	993	18	0.29	1.78(1.45–2.18)
Caucasian	3	425	586	0.0	0.58	1.71(1.37–2.13)
Asian	4	866	407	48.8	0.12	1.90(1.24–2.93)

Abbreviation: HWE, Hardy–Weinberg equilibrium. Note: *mean an adjustment for HWE.