Characteristics of hospitals	Matching	With EHR	1:1 matching without replacement			1:1 matching with replacement			1:2 Matching: caliper, with replacement
Characteristics of hospitals	Matching	With EHR	With no EHR	% bias reduction	p-value	With no EHR	% bias reduction	p-value	With no EHR	% bias reduction	p-value
Outpatient consultation	Before	11,568	14,117		0.612	14,117		0.612	14,117		0.612
Outpatient consultation	After	11,568	12,621	58.7	0.834	8728.4	−11.4	0.522	8817.8	−7.9	0.536
Dystocic delivery	Before	290.6	465.5		0.334	465.5		0.334	465.5		0.334
Dystocic delivery	After	290.6	315.4	85.8	0.829	299.2	95.1	0.939	296.2	96.8	0.960
Cesarean section	Before	421.8	381.3		0.735	381.3		0.735	381.3		0.735
Cesarean section	After	421.8	449.4	31.9	0.862	267	−35.2	0.695	366.6	−36.2	0.694
Major sugeries	Before	92.2	189.2		0.432	189.2		0.432	189.2		0.432
Major sugeries	After	92.2	106.4	85.4	0.830	61.2	68.0	0.569	63.2	70.1	0.591
Hospitalisation (days)	Before	30,331	34,337		0.748	34,337		0.748	34,337		0.748
Hospitalisation (days)	After	30,331	31,847	62.1	0.900	26,243	−2.0	0.722	26,120	−5.1	0.716
% bias	Before		34.0%			34.0%			34.0%
% bias	After		9.3%			19.0%			18.6%