Table 4.

Comparison of visits attended between intervention and comparison groups, controlling for demographic characteristics.

Variable	Intention-to-treat			Per-protocol
	IRRa	Robust SE	P value		IRR	Robust SE	P value
Intervention group	0.87	0.06	.07		0.85	0.05	.004
Age at registration	1.01	0.01	.48		1.01	0.01	.50
Married/in partnership	0.95	0.10	.63		0.95	0.11	.67
Parity	0.98	0.02	.39		0.98	0.02	.37
Employed and/or partner employed	0.91	0.06	.15		0.92	0.07	.26
Distance from home village to registration clinic (km)	1.00	0.00	.38		1.00	0.00	.30
Gestation at registration (weeks)	0.99	0.00	.001		0.99	0.00	.004
Constant	3.36	0.58	<.001		3.31	0.52	<.001

^aIRR: incidence rate ratio.