Table 1.
Sample Characteristics
| Variables | N | M (SD) |
|---|---|---|
| Maternal education at 1 month [years] | 508 | 14.70 (2.39) |
| Income to needs ratio (across 54 months) | 507 | 3.89 (2.70) |
| Maternal depression (across 54 months) | 508 | 9.23 (6.18) |
| Parenting quality (across 54 months) | 505 | .18 (.58) |
| Partner presence (across 54 months) | 508 | 90.65 (23.16) |
| Child temperament at 6 months | 499 | 3.13 (.40) |
| Child care quality (across 54 months) | 464 | 2.82 (.24) |
| Child care hours (across 54 months) | 502 | 25.89 (16.07) |
| Center child care (across 54 months) | 495 | .23 (.28) |
| Child gender | ||
| Boy | 251 | 49.4% |
| Girls | 257 | 50.6% |
| Child DRD4 | ||
| DRD4-7R present | 135 | 26.6% |
| DRD4-7R absent | 373 | 73.4% |
| Child 5-HTTLPR | ||
| l/l | 143 | 28.1% |
| l/s | 255 | 50.2% |
| s/s | 110 | 21.7% |
| Child externalizing behavior at 54 months | 354 | 49.75 (9.53) |
| Child externalizing behavior at KG | 465 | 49.05 (8.53) |
| Child externalizing behavior at G1 | 471 | 49.76 (8.32) |
| Child externalizing behavior at G2 | 451 | 49.50 (8.26) |
| Child externalizing behavior at G3 | 471 | 50.40 (8.37) |
| Child externalizing behavior at G4 | 454 | 49.18 (8.21) |
| Child externalizing behavior at G5 | 464 | 49.78 (8.27) |
| Child externalizing behavior at G6 | 439 | 49.32 (8.91) |
| Child social skills at KG | 458 | 104.81 (13.61) |
| Child social skills at G1 | 467 | 105.06 (13.06) |
| Child social skills at G2 | 449 | 106.86 (13.45) |
| Child social skills at G3 | 467 | 103.84 (13.41) |
| Child social skills at G4 | 453 | 104.16 (13.16) |
| Child social skills at G5 | 464 | 104.23 (13.73) |
| Child social skills at G6 | 430 | 104.50 (14.08) |