Comparison 1.

Supine midline head position with the bed at 0° versus supine head rotated 90° with the bed at 0°

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Intraventricular hemorrhage, any grade	2	110	Risk Ratio (M‐H, Fixed, 95% CI)	1.14 [0.55, 2.35]
2 Intraventricular hemorrhage, grade 3 to 4	2	110	Risk Ratio (M‐H, Fixed, 95% CI)	1.57 [0.28, 8.98]
3 Neonatal mortality	2	110	Risk Ratio (M‐H, Fixed, 95% CI)	0.52 [0.16, 1.65]
4 Cystic periventricular leukomalacia	1	48	Risk Ratio (M‐H, Fixed, 95% CI)	3.25 [0.14, 76.01]
5 Retinopathy of prematurity, any stage	1	42	Risk Ratio (M‐H, Fixed, 95% CI)	2.27 [0.85, 6.11]
6 Retinopathy of prematurity, ≥ stage 3	1	42	Risk Ratio (M‐H, Fixed, 95% CI)	2.73 [0.31, 24.14]