Maternal serum level of resistin is associated with risk for gestational diabetes mellitus: A meta-analysis

Table 3 Summary of different comparative results of serum resistin level with gestational diabetes mellitus risk

Category		No. of comparisons	No. of cases	No. of controls	SMD (95%CI)	Z	P	I2%	Phet
Overall		22	1041	1292	0.250 (0.116, 0.384)	3.65	0.000	53.1	0.002
Gestational age at blood sampling	Before 14 wk	4	326	549	0.087 (-0.055, 0.230)	1.20	0.229	0.0	0.550
	14-28 wk	8	408	415	0.217 (-0.003, 0.436)	1.93	0.053	55.5	0.028
	After 28 wk	9	277	298	0.394 (0.108, 0.680)	2.70	0.007	60.5	0.009
	Postpartum	1	30	30	0.571 (0.054, 1.087)	-	-	-	-
Need for insulin	No need for insulin	12	555	776	0.177 (0.018, 0.336)	2.18	0.029	43.7	0.052
	Need for insulin	6	317	305	0.403 (0.119, 0.687)	2.78	0.005	44.9	0.106
	No information	4	169	211	0.356 (-0.143, 0.855)	1.40	0.162	80.6	0.001

P_het: P value for heterogeneity; OR: Odds ratio; CI: Confidence interval; SMD: Standardized mean difference.