TABLE 1—
Characteristics of the 1994 and 1999 Cohorts Born at Hospital De Clínicas de Porto Alegre, Brazil
| 1994 n = 187, No. (%) | 1999 n = 250, No. (%) | P | |
| Mother’s age ≥ 21 y | 147 (78.6) | 174 (69.6) | .045 |
| Mother’s schooling ≥ 8 y | 91 (48.7) | 126 (50.4) | .729 |
| Per capita income 50% of minimum salary (US $90 per month)a | 158 (84.5) | 174 (73.4) | .008 |
| Mother White | 129 (69.0) | 182 (72.8) | .444 |
| Mother’s first child | 81 (43.3) | 104 (41.6) | .794 |
| Average breastfeeding time of previous children 4 mob | 64 (60.4) | 108 (74.0) | .430 |
| Vaginal birth | 149 (79.7) | 193 (77.2) | .614 |
| Male newborn | 88 (47.1) | 139 (55.6) | .095 |
| Parents legally married | 75 (40.1) | 50 (20.0) | .001 |
| Prenatal care with 5 consultations | 147 (78.6) | 206 (82.4) | .383 |
aThis information was obtained for 237 families in the 1999 study.
bExcluding firstborns (n = 106 in the 1994 cohort and n = 146 in the 1999 cohort).