Fig. 5
Forest plots of a coronal angulation and b sagittal angulation. Compared to SP, IP had greater coronal angulation (MD: − 2.09°; 95% CI − 2.47 to − 1.71; P < 0.001; I2 = 75%) but similar sagittal angulation (MD: − 1.40°; 95% CI − 3.43 to 0.64; P = 0.18; I2 = 99%). CI confidence interval, MD mean difference