Table 5. Subgroup analysis of the associations of IGF2BP2 rs4402960 (G>T) polymorphisms with gestational diabetes mellitus.

Subgroup	N	Allele model (T vs. G allele)				Dominant model (TT+GT vs. GG)				Recessive model (TT vs. GG+GT)				Heterozygous model (TT vs. GT)				Homozygous model (TT vs. GG)
		Test of association		Test of heterogeneity		Test of association		Test of heterogeneity		Test of association		Test of heterogeneity		Test of association		Test of heterogeneity		Test of association		Test of heterogeneity
		Odds ratio (95% CI)	P	I2 (%)	P	Odds ratio (95% CI)	P	I2 (%)	P	Odds ratio (95% CI)	P	I2 (%)	P	Odds ratio (95% CI)	P	I2 (%)	P	Odds ratio (95% CI)	P	I2 (%)	P
Genotyping method
TaqMan assay	5	1.07 (0.91–1.26)	0.410	71.7	0.007	1.08 (0.87–1.33)	0.491	72.0	0.006	1.15 (0.96–1.38)	0.135	37.3	0.173	1.06 (0.87–1.30)	0.552	67.4	0.015	1.16 (0.86–1.56)	0.321	54.6	0.066
PCR-RFLP	2	0.78 (0.55–1.11)	0.164	33.1	0.222	0.65 (0.25–1.67)	0.368	80.4	0.024	0.64 (0.37–1.10)	0.107	28.6	0.237	0.64 (0.19–2.14)	0.468	86.8	0.006	0.63 (0.35–1.12)	0.115	0	0.628
Ethnicity
Caucasian	3	0.99 (0.80–1.23)	0.949	52.9	0.120	1.02 (0.73–1.42)	0.906	65.8	0.053	0.91 (0.68–1.23)	0.550	46.8	0.153	1.04 (0.71–1.53)	0.837	71.4	0.030	0.93 (0.62–1.40)	0.722	38.3	0.198
Asian	4	1.00 (0.78–1.28)	0.988	81.5	0.001	0.96 (0.70–1.32)	0.810	82.0	0.001	1.19 (0.96–1.47)	0.120	50.9	0.106	0.94 (0.69–1.29)	0.722	79.0	0.003	1.16 (0.75–1.79)	0.510	64.8	0.036
Control source
Hospital-based	6	0.96 (0.80–1.16)	0.691	73.4	0.002	0.94 (0.72–1.23)	0.675	76.7	0.001	0.99 (0.80–1.22)	0.953	48.2	0.086	0.95 (0.92–1.25)	0.703	76.3	0.001	0.97 (0.69–1.37)	0.874	54.0	0.054
Population-based	1	1.19 (1.02–1.39)	0.031	–	–	1.20 (0.98–1.47)	0.084	–	–	1.37 (0.97–1.92)	0.073	–	–	1.14 (0.92–1.42)	0.231	–	–	1.45 (1.02–2.08)	0.039	–	–

Abbreviations: CI, confidence interval; HWE, Hardy–Weinberg equilibrium; OR, odds ratio; PCR-RFLP, polymerase chain reaction-restriction fragment length polymorphism.