Comparison 13.

Doppler ultrasound versus no Doppler ultrasound ‐ previous pregnancy loss

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Any perinatal death after randomisation (previous pregnancy loss)	1	53	Risk Ratio (M‐H, Fixed, 95% CI)	0.26 [0.03, 2.17]
1.1 Singleton pregnancy	0	0	Risk Ratio (M‐H, Fixed, 95% CI)	0.0 [0.0, 0.0]
1.2 Multiple pregnancy	0	0	Risk Ratio (M‐H, Fixed, 95% CI)	0.0 [0.0, 0.0]
1.3 Singleton plus multiple pregnancies	0	0	Risk Ratio (M‐H, Fixed, 95% CI)	0.0 [0.0, 0.0]
1.4 Not specified whether singleton or multiple pregnancies	1	53	Risk Ratio (M‐H, Fixed, 95% CI)	0.26 [0.03, 2.17]
2 Serious neonatal morbidity (previous pregnancy loss)	1	53	Risk Ratio (M‐H, Fixed, 95% CI)	0.0 [0.0, 0.0]
2.1 Singleton pregnancy	0	0	Risk Ratio (M‐H, Fixed, 95% CI)	0.0 [0.0, 0.0]
2.2 Multiple pregnancy	0	0	Risk Ratio (M‐H, Fixed, 95% CI)	0.0 [0.0, 0.0]
2.3 Singleton plus multiple pregnancies	0	0	Risk Ratio (M‐H, Fixed, 95% CI)	0.0 [0.0, 0.0]
2.4 Not specified whether singleton or multiple pregnancies	1	53	Risk Ratio (M‐H, Fixed, 95% CI)	0.0 [0.0, 0.0]