Comparison 3. Sildenafil plus iNO versus placebo plus iNO.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 All‐cause mortality	1	24	Risk Difference (M‐H, Fixed, 95% CI)	0.05 [‐0.27, 0.37]
2 Length of stay in hospital (days)	1	24	Mean Difference (IV, Fixed, 95% CI)	5.39 [‐5.31, 16.09]
3 Inotropic agent	1	24	Risk Ratio (M‐H, Fixed, 95% CI)	1.06 [0.37, 3.00]
4 Duration of ventilation (days)	1	24	Mean Difference (IV, Fixed, 95% CI)	1.26 [‐1.32, 3.84]
5 Retinopathy of prematurity	1	24	Odds Ratio (M‐H, Fixed, 95% CI)	0.0 [0.0, 0.0]