GH VS Normotensive
Four studies (5216 twin pregnancies) explored the risk of birthweight discordance (≥15%) in twin pregnancies with GH compared to Normotensive group. In all, no evident association was observed between GH and the incidence of intertwin birthweight discordance (OR 1.24, 95% CI 0.96-1.60; I2 =0%). According to the stratified sampling, GH was a risk factor for birthweight discordance in DC group (OR 2.08, 95% CI 1.33-3.25; I2 =0%), but a protective factor in MC group (OR 0.37, 95% CI 0.16-0.82; I2 =0%). (Figure 2)