Table 2. Characteristics of Children in the Study Sample by Battery.
| Battery A (nA = 676) | Battery B (nB = 635) | |
|---|---|---|
| Child's age, % | ||
| 6–18 months | 33.7 | 33.9 |
| 19–30 months | 33.6 | 35.7 |
| 31–42 months | 32.7 | 30.4 |
| Socio-economic sector (strata), % | ||
| 1. Lowest | 30.3 | 29.8 |
| 2. | 32.7 | 37.0 |
| 3. | 36.1 | 32.6 |
| 4. Highest | 0.9 | 0.6 |
| Girls, % | 47.6 | 51.0 |
| Premature (gestional age <37 weeks), % | 15.2 | 15.1 |
| Birth weighta, gr, mean (SD) | 3066 (514) | 3015 (510) |
| Stunted (z-score height-for-age <-2SD) | 16.9 | 17.7 |
| Mother's agea, y, mean (SD) | 27.2 (6.9) | 26.6 (6.4) |
| Mother's educationa, y, mean (SD) | 10.3 (3.4) | 10.4 (3.3) |
| Father's educationa, y, mean (SD) | 8.15 (4.0) | 8.7 (4.0) |
| Bayley-III Raw Scores, mean (SD) | ||
| Cognitive | 58.7 (14.5) | 58.8 (13.5) |
| Receptive language | 25.3 (9.3) | 25.6 (8.9) |
| Expressive language | 25.0 (10.3) | 25.5 (10.2) |
| Fine motor | 39.5 (10.1) | 39.1 (10.0) |
| Gross motor | 52.2 (11.7) | 52.6 (11.4) |
| Bayley-III Composite Scores, mean (SD) | ||
| Cognitive | 97.8 (7.8) | 98.9 (9.9) |
| Language | 95.3 (8.4) | 97.8 (11.1) |
| Motor | 99.3 (10.1) | 99.7 (11.6) |
a Missing data for: birth weight (nA = 638, nB = 552), mother's age (nA = 668, nB = 618), mother's education (nA = 674, nB = 633), father's education (nA = 639, nB = 576). SD is Standard Deviation.