Table 1 Demographic characteristics of the participants
Variables | n (%) |
|---|---|
Sex | |
 Male | 893 (51.0) |
 Female | 859 (49.0) |
Gestational age (days) | |
 < 259 (preterm) | 52 (3.0) |
 ≥ 259 (term) | 1638 (93.5) |
 Unknown | 62 (3.5) |
Birth weight (g) | |
 < 2500 | 49 (2.8) |
 ≥ 2500 | 1647 (94.0) |
 Unknown | 56 (3.2) |
Household income | |
 ≤ 2000 | 432 (24.7) |
 > 2000 and ≤ 3000 | 532 (30.4) |
 > 3000 and ≤ 4000 | 315 (18.0) |
 > 4000 and ≤ 5000 | 193 (11.0) |
 > 5000 | 111 (6.3) |
 Unknown | 169 (9.6) |
Paternal educational level (years) | |
 ≤ 12 | 520 (29.7) |
 > 12 and < 16 | 486 (27.7) |
 ≥ 16 | 680 (38.8) |
 Unknown | 66 (3.8) |
Maternal educational level (years) | |
 ≤ 12 | 454 (25.9) |
 > 12 and < 16 | 362 (20.7) |
 ≥ 16 | 809 (46.2) |
 Unknown | 127 (7.2) |
Age at each assessment (months; mean; SD) | |
 T1 | 5.5 (1.2) |
 T2 | 14.1 (1.0) |
 T3 | 26.2 (1.3) |
 T4 | 38.7 (1.4) |
 T9 | 99.2 (1.4) |