Table 1.
Infant Temperament Descriptives
| Dimension | MLS 4-month (n = 1085)
|
IDEAL 12-month (n = 333)
|
Z-score | ||||
|---|---|---|---|---|---|---|---|
| M | SD | Range | M | SD | Range | ||
| Activity Level | 3.24 | 0.64 | 1.60–4.90 | 3.34 | 0.65 | 1.88–5.00 | 0.00 |
| Smiling and Laughter | 3.52 | 0.72 | 1.61–5.00 | 3.92 | 0.54 | 2.42–5.00 | 0.13 |
| Fear | 2.37 | 0.65 | 1.00–4.25 | 2.51 | 0.62 | 1.00–4.00 | 0.00 |
| Distress to Limitations | 2.53 | 0.57 | 1.00–4.06 | 2.69 | 0.56 | 1.25–4.10 | −0.07 |
| Soothability | 3.47 | 0.70 | 2.00–5.00 | 3.46 | 0.75 | 1.50–5.00 | 0.04 |
| Orienting | 3.01 | 0.59 | 1.25–4.64 | 2.72 | 0.54 | 1.33–4.19 | −0.01 |
Note: Means and standard deviations (SD) for variables with missing data were computed using maximum likelihood with robust standard errors. None of the mean differences were statistically different at the p < .05 level. MLS, Maternal Lifestyle Study. IDEAL, Infant Development, Environment, and Lifestyle study.