Table 4.

Intervention effect on a) the primary, secondary and exploratory outcomes and b) the primary outcome by baseline compliance.

(a) Intervention effect on the primary and secondary outcomes	Adjusted for baseline IFA and gravida
Primary outcome	Odds ratio	Lower 95% CI	Upper 95% CI	p	n	Marginalized difference in proportion	Lower 95% CI	Upper 95% CI	n for marginal effect
Compliance with recommended iron and folic acid tablet (IFA) intake	1.33	0.75	2.35	0.334	271	0.05	−0.05	0.15	299

	Adjusted for baseline outcome value (where available), baseline IFA and gravida
Secondary outcomes (counts)	Coefficient (difference)	Lower 95% CI	Upper 95% CI	p	n
Dietary diversity	0.19	−0.15	0.54	0.272	271
Knowledge of iron-rich foods	0.96	0.50	1.42	<0.001	271
ANC visits between baseline and endline	0.02	−0.15	0.20	0.81	271
Binary secondary outcomes	Odds ratio	Lower 95% CI	Upper 95% CI	p	n	Marginalized difference in proportion	Lower 95% CI	Upper 95% CI	n for marginal effect
Consumption of intervention-promoted foods	1.81	1.08	3.02	0.023	271	0.13	0.02	0.24	298
Practicing one or more methods to enhance iron bioavailability, including avoiding tea close to meals	4.41	1.23	15.83	0.023	271	0.08	0.01	0.16	298
Exploratory outcomes	Odds ratio	Lower 95% CI	Upper 95% CI	p	n	Marginalized difference in proportion	Lower 95% CI	Upper 95% CI	n for marginal effect
Understanding of why blood tests are taken at antenatal check-ups (among those who had blood tests)	1.93	0.27	13.93	0.513	35	0.11	−0.22	0.44	48
Knowledge of COVID-19 symptoms, precautions, and vulnerability	4.06	1.56	10.54	0.004	271	0.11	0.03	0.20	299

(b) Intervention effect on the primary outcome by baseline compliance	Adjusted for gravida
Disaggregated analyses for women complying and not complying at baseline	Odds ratio	Lower 95% CI	Upper 95% CI	p	n	Marginalized difference in proportion	Lower 95% CI	Upper 95% CI	n for marginal effect	p-value for interaction between IFA compliance at baseline and study arma
Women taking IFA on 12/14 days at baseline	0.84	0.37	1.90	0.675	147	−0.03	−0.16	0.10	159	0.14
Women not taking IFA on 12/14 days at baseline	2.04	0.90	4.64	0.088	124	0.14	−0.01	0.29	140

^aInteraction between IFA compliance at baseline and study arm based on the model adjusting for gravida only.

ANC, antenatal care; COVID-19, coronavirus disease 2019; CI, confidence interval; IFA, iron folic acid.