Table 1.
Sample characteristics according to independent variables (Number of participants and percentage). Pelotas 2004 birth cohort study
| Variables | N | % |
|---|---|---|
| SEP (quintiles) | ||
| 1st (lower) | 784 | 22.9 |
| 2nd | 716 | 21.0 |
| 3rd | 766 | 22.4 |
| 4th | 553 | 16.2 |
| 5th (higher) | 595 | 17.4 |
| Maternal age at birth (years) | ||
| 18–35 | 2733 | 79.8 |
| < 18 | 324 | 9.5 |
| > 35 | 367 | 10.7 |
| Children’s sex | ||
| Male | 1772 | 51.9 |
| Female | 1645 | 48.1 |
| Children’s skin colour | ||
| White | 2324 | 71.4 |
| Brown | 502 | 15.4 |
| Black | 428 | 13.2 |
| Exclusive breastfeeding | ||
| 0–7 days | 859 | 25.4 |
| 8 days - <1 month | 375 | 11.1 |
| 1 - <3 months | 1421 | 42.1 |
| ≥ 3 months | 721 | 21.4 |
| Age of introduction of complementary food | ||
| ≥ 4 months | 498 | 14.8 |
| 1–3.9 months | 1685 | 49.9 |
| < 1 month | 1190 | 35.3 |
| BMI at 6 years (z-score) | ||
| Normal | 2016 | 65.0 |
| Overweight | 555 | 17.9 |
| Obese | 533 | 17.2 |
SEP Socioeconomic position, BMI Body mass index