Table 2. Socio-demographic characteristics of mother-infant pairs enrolled in the baseline survey, for specific subpopulations (unweighted N and %), Zimbabwe, 2012.

	‘HIV-exposed infants’ and their mothers, irrespective of whether they were exposed to Option A or not (sample A)		Infants ‘unexposed to Option A activities based on their residence’ and their mothers (sample B1)
	N	%	N	%
	(n = 1075)*		(n = 759)*
Mothers’ age
16–20 years	67	6.3	51	6.8
21–25 years	264	24.8	184	24.6
26–30 years	323	30.4	229	30.6
31–35 years	268	25.2	183	24.4
36+ years	141	13.3	102	13.6
Mothers’ ethnicity
Shona	757	71.2	556	74.2
Ndebele	163	15.3	97	13.0
Other	143	13.5	96	12.8
Mothers’ marital status
Married	863	81.2	596	79.6
Previously married	143	13.5	110	14.7
Never married	57	5.4	43	5.7
Mothers’ parity
1 birth	150	14.2	116	15.5
2 births	269	25.4	188	25.2
3 births	265	25.0	185	24.8
4+ births	376	35.5	258	34.5
Mothers’ education
Primary or less	424	39.9	294	39.3
Form 1–3	337	31.7	231	30.8
Form 4	293	27.6	217	29.0
Form 5+	9	0.9	7	0.9
Household size
1–3 people	223	21.0	170	22.7
4 people	245	23.1	160	21.4
5 people	233	21.9	167	22.3
6 people	152	14.3	102	13.6
7+ people	210	19.8	150	20.0
Household food insecurity
Severe insecurity	303	28.5	205	27.4
Some insecurity	343	32.3	255	34.1
Food secure	417	39.2	289	38.6
Mothers employed	246	23.3	172	23.2
Infants alive or deceased
Deceased	19	1.8	13	1.7
Alive	1050	98.2	739	98.3
Among alive infants	(n = 1050)		(n = 739)
Infants’ age
9–10 months	235	22.4	65	8.8
11–12 months	238	22.7	148	20.0
13–14 months	222	21.1	195	26.4
15–16 months	196	18.7	179	24.2
17–18 months	159	15.1	152	20.6

* Sample size differs from the one listed in Fig 2, as i) this table only examines data regarding biological mothers and ii) some of the biological mothers included in the estimate of HIV-free infant survival did not answer the questionnaire.