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Forest plot for the recessive model (GG vs CG+CC). Utilizing the Hartung–Knapp random-effects model, no significant association was identified under the recessive model. The pooled odds ratio (OR) was 0.82 (95% confidence interval [CI]: 0.54–1.25; P ═ 0.33), with a 95% PI of 0.37–1.81 and I2 ═ 0%. These results indicate that homozygosity for the Ala (G) allele does not significantly alter the risk of gestational diabetes mellitus (GDM).
