Maternal characteristics from pregnancy to 24 months post partum, children characteristics at birth and proportion of children who suffered injuries from 24 to 48 months of age: Pelotas 2004 Birth Cohort; Pelotas, RS, Brazil
| Characteristics | Boys (n=1840) | Girls (n=1693) | Total (n=3533) | |||
| n | % | n | % | n | % | |
| Maternal characteristics | ||||||
| Brazilian National Economic Index (n=3533) | ||||||
| Q1← poorest | 355 | 19.3 | 315 | 18.6 | 670 | 19.0 |
| Q2 | 333 | 18.1 | 348 | 20.6 | 681 | 19.3 |
| Q3 | 364 | 19.8 | 359 | 21.2 | 723 | 20.5 |
| Q4 | 400 | 21.7 | 332 | 19.6 | 732 | 20.7 |
| Q5← richest | 388 | 21.1 | 339 | 20.0 | 727 | 20.6 |
| Age (years) (n=3531) | ||||||
| <20 | 339 | 18.4 | 316 | 18.7 | 655 | 18.6 |
| 21–30 | 993 | 54.0 | 893 | 52.8 | 1886 | 53.4 |
| ≥31 | 508 | 27.1 | 482 | 28.5 | 990 | 28.0 |
| Education level (years) (n=3499) | ||||||
| 0–4 | 271 | 14.8 | 252 | 15.1 | 523 | 15.0 |
| 5–8 | 743 | 40.7 | 692 | 41.4 | 1435 | 41.0 |
| >8 | 814 | 44.5 | 727 | 43.5 | 1541 | 44.0 |
| Live with a partner (yes) (n=3533) | 1553 | 84.4 | 1434 | 84,7 | 2987 | 84.6 |
| Number siblings in the household (24 months) (n=3533) | ||||||
| None | 878 | 47.7 | 720 | 42.5 | 1598 | 45.2 |
| 1–2 | 796 | 43.3 | 798 | 47.1 | 1594 | 45.1 |
| ≥3 | 166 | 9.0 | 175 | 10.3 | 341 | 9.7 |
| Type of family (24 months) (n=3533) | ||||||
| Nuclear | 1393 | 75.7 | 1288 | 76.1 | 2681 | 75.9 |
| Extensive | 447 | 24.3 | 405 | 23.9 | 852 | 24.1 |
| Planned pregnancy (yes) (n=3532) | 677 | 36.8 | 567 | 33.5 | 1244 | 35.2 |
| Smoking during pregnancy (yes) (n=3533) | 489 | 26.6 | 457 | 27.0 | 946 | 26.8 |
| Alcohol consumption during pregnancy (yes) (n=3533) | 63 | 3.4 | 53 | 3.1 | 116 | 3.3 |
| Maternal depression during pregnancy (yes) (n=3533) | 450 | 24.5 | 409 | 24.2 | 859 | 24.3 |
| Edinburgh Postnatal Depression Scale at 12 months≥13 (n=3533) | 266 | 14.5 | 255 | 15.1 | 521 | 14.8 |
| Edinburgh Postnatal Depression Scale at 24 months≥13 (n=3533) | 277 | 15.1 | 280 | 16.5 | 557 | 15.8 |
| Child characteristics | ||||||
| Child’s skin colour (white) (n=3326) | 1165 | 67.4 | 1074 | 67.3 | 2239 | 67.3 |
| Low birth weight (<2500 g) (n=3532) | 128 | 7.0 | 149 | 8.8 | 277 | 7.8 |
| Prematurity (<37 weeks) (n=3529) | 228 | 12.4 | 221 | 13.1 | 449 | 12.7 |
| Injuries between 24 and 48 months (yes) | ||||||
| Falls (n=3532) | 1319 | 71.2 | 1145 | 67.6 | 2464 | 69.8 |
| Cuts (n=3531) | 590 | 32.1 | 485 | 28.6 | 1075 | 30.4 |
| Burns (n=3532) | 327 | 17.8 | 266 | 15.7 | 593 | 16.8 |