Table 1.

General characteristics of children studied for micronutrient deficiencies and children participating in the total survey

	Regular Regimen (RR)				IMSS-Oportunidades (IO)
	Micronutrient sample		Survey sample		Micronutrient sample		Survey sample
	Mean	95% CI	Mean	95% CI	Mean	95% CI	Mean	95% CI
Age (months)	11.4	10.6, 13.4	8.6a	8.0, 9.2	13.4	12.3, 14.6	10.7a	12.3, 14.6
< 6 (%)	13.2	8.5, 19.7	37.7	33.0, 42.7	4.9	2.8, 8.2	27.6	24.6, 30.8
6–11	38.2	34.8, 41.7	38.2	30.6, 34.6	31.0	24.0, 39.1	27.1	25.6, 28.7
12–23	48.7	41.8, 55.6	29.7	26.1, 33.6	64.1	57.4, 70.2	45.3	42.4, 48.3
Sex Male (%)	50.4	48.4, 52.4	51.5	50.6, 52.4	51.8	48.8, 54.8	51.2	49.5, 52.9
Weight for age (Z score)	-0.151	-0.308, 0.005	0.072	-0.04, 0.188	-0.604	-0.615, -0.393	-0.318b	-0.454, -0.186
Height for age (Z score)	-0.188	-0.297, -0.078	-0.119	-0.278, 0.039	-1.164	-1.585, -0.743	-0.873	-1.052, -0.694
Characteristics of mothers
Years of study	9.0	8.5, 9.6	9.2	8.8, 9.5	5.3	4.4, 6.1	5.3	4.8, 5.7
Work outside home (%)	24.4	18.4, 31.5	25.6	21.8, 29.8	8.2	6.5, 10.3	9.8	7.2, 13.2
Characteristics of fathers
Years of study	9.2	8.7, 9.7	9.3	8.9, 9.7	5.3	4.5, 6.2	5.5	5.1, 5.9
Occupation (%):
General services	3.6	3.1, 5.2	4.0	2.3, 5.6	1.3	0.9, 2.0	1.2	0.9, 1.6
Manual laborer	27.4	23.2, 28.4	25.7	23.1, 32.1	29.0	21.9, 37.2	28.6	21.2, 37.4
Clerk	51.4	48.8, 58.0	53.4	43.0, 59.8	7.8	4.7, 12.6	7.3	4.6, 11.6
Small business owner	4.6	4.2, 5.8	4.9	3.2, 4.2	4.4	2.8, 6.9	4.6	2.8, 7.5
Technician	6.7	4.7, 6.4	5.5	5.3, 8.3	0.7	0.4, 1.1	0.6	0.3, 1.0
Professional	5.2	3.7, 5.6	4.5	3.0, 9.0	2.1	1.4, 3.1	2.2	1.4, 3.4
Art and culture	0.4	0.3, 0.7	0.5	0.2, 1.0	0.3	0.2, 0.5	0.3	0.1, 0.5
Land and agriculture	0.7	0.8, 2.5	1.4	0.3, 1.6	52.9	43.6, 62.0	53.7	44.8, 62.4
Migrant					1.3	0.7, 2.6	1.5	0.7, 2.9

95% CI: 95% confidence interval

^ap < 0.001 ^bp = 0.018