Table I.

Sociodemographic characteristics of mothers.

	Celaya		Merida		Total
Variable	n	(%)	n	(%)	n	(%)
Age group
18–19	90	18.4	85	17.0	175	17.7
20–29	263	53.9	326	65.2	589	59.6
30–39	122	25.0	81	16.0	203	20.5
40–90	13	2.7	8	1.6	21	2.1
Total	488	100	500	100	988	100
Education
<7 yr	217	44.5	217	43.4	434	43.9
≥7 yr	271	55.5	283	56.6	554	56.1
Total	488	100	500	100	988	100
Residence area
Rural	188	38.5	113	23.0	300	30.4
Urban	300	61.5	387	77.0	688	67.7
Total	488	100	500	100	988	100
Parity
Primiparous	139	28.5	179	35.8	318	32.3
Multiparous	347	71.4	321	64.2	670	67.7
Total	486	100	500	100	986	100
Gestational age (wk)
18–31	3	0.6	2	0.4	5	0.5
32–36	35	7.2	33	6.6	68	6.9
37–50	450	92.2	463	93.0	913	92.6
Total	488	100	498	100	986	100
Type of delivery
Vaginal	296	60.7	286	57.2	582	58.9
Cesarean section	192	39.3	214	42.8	406	41.1
Total	488	100	500	100	988	100
Birthweight (g)
<2,500	27	5.5	33	6.6	58	5.9
2,500–2,999	102	20.9	130	26.0	231	23.4
3,000–3,499	229	46.9	231	46.2	462	46.8
3,500 or more	130	26.6	106	21.2	237	24.0
Total	488	100	500	100	988	100