Characteristic	Case (n = 58)		Control (n = 61)		P value
Characteristic	n	%	n	%	P value
Sex
Male	38	65.5	36	59.0	0.5879*
Female	20	34.5	25	41.0	0.5879*
Age range, years
2 to 4	25	43.1	21	34.4	0.3575**
5 to 9	14	24.1	22	36.1
10 to 15	19	32.8	18	29.5
Nutritional status (A/I)
Low	14	25.0	8	17.5	0.1895*
Appropriate	44	75.0	53	82.5
Guardian
Mother	52	89.7	53	86.9	0.8539*
Other	6	10.3	8	13.1
Educational status
No formal education	39	67.2	19	31.1	<0.0001**
Primary (1 - 8 th)	15	25.9	17	27.9
Secundary+	4	6.9	11	18.0
Marital status
Married	36	62.1	42	68.8	0.5583*
Single	22	37.9	19	31.2
Occupation
Unstable	53	91.4	40	65.6	0.0046*
Stable	5	8.6	21	34.4
Family income
<100 US$	42	72.4	31	50.8	0.0258*
≥100 US$	16	27.6	30	49.2