Subgroup analysis
Subgroup comparison was possible to conduct only for two intervention categories: diet based
and mixed approach. There was no subgroup differences based on maternal risk for GDM for
both intervention groups and for BMI category comparison for the mixed approach group
(Table 2). There was a significant difference according to the BMI for diet based intervention (p = 0.04). A significant reduction in GDM was observed in the subgroup comprised of obese
and overweight women (RR 0.40; 95% CI 0.18, 0.86, I2 = 29%).