Table 1.
Follow-up rate at 30 years of age according to baseline characteristics of the cohort
| Variable | Original cohort (number) | Followed at 30 yearsa |
|---|---|---|
| Sex | ||
| Male | 3037 | 65.2% |
| Female | 2876 | 71.1% |
| Birthweight (g) | ||
| < 2500 | 534 | 72.1% |
| 2500–2999 | 1393 | 69.1% |
| 3000–3499 | 2220 | 66.0% |
| ≥ 3500 | 1762 | 68.6% |
| Gestational age (weeks) | ||
| 37 | 294 | 74.5% |
| ≥ 37 | 4380 | 68.1% |
| Family income at birth (minimum wages) | ||
| < 1 | 1288 | 66.1% |
| 1.1–3 | 2789 | 70.4% |
| 3.1–6 | 1091 | 69.3% |
| 6.1–10 | 382 | 61.3% |
| ≥ 10 | 335 | 60.3% |
| Maternal schooling (years) | ||
| 0–4 | 1960 | 68.0% |
| 5–8 | 2454 | 70.5% |
| 9–11 | 654 | 66.1% |
| ≥ 12 | 839 | 62.8% |
aThose participants who were known to have died were considered as followed.