Table 2.
Descriptive statistics (Percentage of sample for ordinal variables and means and standard deviations for continuous variables).
| 14 months | 20 months | 24 months | 36 months | |
|---|---|---|---|---|
| Concern for Others | ||||
| Mother Interview | 0 – 35.5% | 0 – 7.2% | 0 –5.4% | 0 – 2.1% |
| 1 – 29.9% | 1 – 24.6% | 1 – 16.0% | 1 – 13.8% | |
| 2 – 24.5% | 2 – 44.4% | 2 – 42.1% | 2 – 47.1% | |
| 3 – 10.1% | 3 – 23.8% | 3 – 36.5% | 3 – 37.0% | |
| Observations | 0 – 30.4% | 0 – 13.8% | 0 – 8.4% | 0 – 10.3% |
| 1 – 41.1% | 1 – 36.3% | 1 – 26.3% | 1 – 19.8% | |
| 2 – 19.8% | 2 – 27.0% | 2 – 27.6% | 2 – 25.8% | |
| 3 – 8.7% | 3 – 22.9% | 3 – 37.7% | 3 – 44.1% | |
| Disregard for Others | ||||
| Mother Interview | 0 – 43.7% | 0 – 35.2% | 0 – 35.1% | 0 – 37.4% |
| 1 – 23.5% | 1 – 33.9% | 1 – 36.0% | 1 – 36.7% | |
| 2 – 17.3% | 2 – 18.5% | 2 – 17.7% | 2 – 15.2% | |
| 3 – 15.5% | 3 – 12.4% | 3 – 11.2% | 3 – 10.8% | |
| Observations | 0 – 78.5% | 0 – 87.9% | 0 – 88.5% | 0 – 84.4% |
| 1 – 15.5% | 1 – 9.7% | 1 – 8.8% | 1 – 11.9% | |
| 2 – 6.1% | 2 – 2.4% | 2 – 2.7% | 2 – 3.6% | |
| Language Skills | 19.05 (4.22) | 32.48 (5.59) | 41.05 (5.36) | 10.07 (4.26) |
| General Cognitive Ability | 112.43 (5.50) | 136.06 (8.54) | 148.78 (8.30) | 103.13 (17.70) |
Note. A different assessment was administered at age 36 months to assess general cognitive ability, and a different set of items were administered at age 36 months to assess language skills. Therefore, the change in general cognitive ability and language skills between 24 and 36 motnhs is not meaningful.