Fig. 2From: Effect of L-arginine and sildenafil citrate on intrauterine growth restriction fetuses: a meta-analysisRandom-effetcs meta-analysis comparing gestational age at labour between control groups and L-aginine groups. The test for heterogeneity was not significant (P = 0.19),the standardized mean difference significantly favors controls (0.30, 95 % CI [0.07,0.54], P = 0.012)Back to article page