Comparison 6. Subgroup analysis.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Health systems vs Population ANC coverage: four or more visits	9		Odds Ratio (Random, 95% CI)	Subtotals only
1.1 Health system interventions	5		Odds Ratio (Random, 95% CI)	1.13 [0.96, 1.34]
1.2 Population interventions	4		Odds Ratio (Random, 95% CI)	1.04 [0.96, 1.13]
2 Health systems vs Population Pregnancy‐related deaths	11		Odds Ratio (Random, 95% CI)	Subtotals only
2.1 Health system interventions	4		Odds Ratio (Random, 95% CI)	1.22 [0.41, 3.65]
2.2 Population intervention	7		Odds Ratio (Random, 95% CI)	0.69 [0.46, 1.03]
3 Country Income Low vs High ANC at least 4 visits	18		Odds Ratio (Random, 95% CI)	1.14 [1.04, 1.25]
3.1 Low or lower middle income countries	11		Odds Ratio (Random, 95% CI)	1.21 [1.04, 1.40]
3.2 High or higher middle income countries	7		Odds Ratio (Random, 95% CI)	1.12 [0.95, 1.32]