Comparison 1. Thyroid hormones versus no thyroid hormones.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Neonatal mortality	1	23	Risk Ratio (M‐H, Fixed, 95% CI)	0.0 [0.0, 0.0]
2 Mortality to discharge	1	23	Risk Ratio (M‐H, Fixed, 95% CI)	1.09 [0.08, 15.41]
3 CLD in survivors (oxygen at 28 days)	1	23	Risk Ratio (M‐H, Fixed, 95% CI)	0.94 [0.45, 1.92]
4 CLD in survivors (oxygen at 36 weeks)	1	23	Risk Ratio (M‐H, Fixed, 95% CI)	0.73 [0.15, 3.57]
5 Patent ductus arteriosus	1	23	Risk Ratio (M‐H, Fixed, 95% CI)	0.62 [0.25, 1.56]
6 Necrotising enterocolitis	1	23	Risk Ratio (M‐H, Fixed, 95% CI)	0.36 [0.02, 8.04]
7 Retinopathy of prematurity (any grade) in survivors	1	23	Risk Ratio (M‐H, Fixed, 95% CI)	0.73 [0.15, 3.57]
8 Weight gain (grams/day)	1	23	Mean Difference (IV, Fixed, 95% CI)	0.51 [‐2.55, 3.57]
9 Growth head circumference (cm/week)	1	23	Mean Difference (IV, Fixed, 95% CI)	0.02 [‐0.15, 0.19]
10 Growth length (cm/week)	1	23	Mean Difference (IV, Fixed, 95% CI)	‐0.06 [‐0.24, 0.12]