Impact of the Umoyo mother-infant pair model on HIV-positive mothers’ social support, perceived stigma and 12-month retention of their HIV-exposed infants in PMTCT care: evidence from a cluster randomized controlled trial in Zambia

Table 6 Distribution (% and 99% confidence interval (CI)) and comparison of child-level outcomes

	Pre implementation		Post implementation		Difference in difference over time (99% CI)	p value from t test
	Control	Intervention	Control	Intervention	Difference in difference over time (99% CI)	p value from t test
Total facilities	14	11	14	11
Total children enrolled in study	166	415	224	368
Proportion of eligible children retained in care at 12-month visit	46.2% (19.8%, 72.5%)	45.7% (13.4%, 77.9%)	45.0% (18.1%, 71.9%)	33.1% (3.8%, 62.2%)	− 11% (− 40.1%, 17.2%)	0.3^a
Proportion of eligible children retained in care at 6-, 9-, and 12-month visits	28.8% (5.0%, 52.5%)	33.2% (3.6%, 62.8%)	28.2% (11.6%, 44.7%)	26.1% (−0.02%, 54.3%)	− 6.5% (− 24.7%, 11.7%)	0.3

^aRemoved the facilities that are not eligible in the pre-intervention (Kazimva and Kanyama West) or post-intervention (Madzimawe) periods

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