Table 2.

Stratified analysis of the 19 studies included in meta-analysis based on study designs, sample size and proportion of health facility deliver, 1988-2012

Stratifying variable	Sample size	Fixed-effects RR (95% CI)	Random-effects RR (95% CI)
Study design
Prospective cohort	15,273	0.87 (0.75, 1.82)	0.82 (0.59, 1.14)
Case-Control	6,994	0.70 (0.60, 0.81)	0.67 (0.43, 1.03)
Cross-Sectional	1,570,085	0.37 (0.35, 0.38)	0.63 (0.41, 0.95)
Community trial	14,453	0.23 (0.19, 0.33)	0.23 (0.19, 0.33)
Sample size
<1,000	4,350	0.62 (0.54, 0.71)	0.62 (0.47, 0.81)
1,000-5,000	8,434	0.63 (0.52, 0.78)	0.56 (0.36, 0.85)
5,001-10,000	26,970	0.76 (0.69, 0.83)	0.91 (0.62, 1.33)
>10,000	1,567,051	0.32 (0.31, 0.34)	0.46 (0.25, 0.83)
% of health facility delivery
<50%	25,667	0.80 (0.71, 0.90)	0.74 (0.59, 0.94)
≥50%	1,581,138	0.37 (0.36, 0.39)	0.60 (0.43, 0.87)