marginally significantp = 0.05
In subgroup analyses ( Figure 5 ), we found marginally significant results favoring boys vs. girls in children aged 3 (SMD = 0.27 (95% CI 0.00, 0.54), p = 0.05) and significant results favoring boys vs. girls aged 4, 5 and 6 years (SMD = 0.58 (95% CI 0.38, 0.77), p < 0.00001; SMD = 0.59 (95% CI 0.31, 0.88), p < 0.00001; SMD = 0.81 (95% CI 0.61, 1.01), p < 0.00001), which increased with age. 3.6.