The effect of increasing the supply of skilled health providers on pregnancy and birth outcomes: evidence from the midwives service scheme in Nigeria

Table 3 Testing for differential pre-trends in outcome variables

	Number	δ (95 % CI)		p-value
Antenatal care in study clinic	1094	0.002	(−0.020, 0.025)	0.854
Any antenatal care	1091	0.009	(−0.011, 0.029)	0.371
4+ antenatal visits	1094	0.003	(−0.021, 0.028)	0.783
Delivery in study clinic	1094	0.004	(−0.019, 0.026)	0.761
Institutional delivery	1094	0.005	(−0.018, 0.028)	0.684
Skilled birth attendance	1094	−0.001	(−0.023, 0.021)	0.916
Intra-partum complications	1094	0.014	(−0.004, 0.032)	0.126
Post-partum complications	1094	0.008	(−0.005, 0.021)	0.213

δ denotes the differential linear trend in intervention communities relative to comparison communities over the period prior to the start of the MSS. The regression specification controls for community fixed effects. Standard errors in parentheses are clustered at the community level

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