TABLE 1.
Descriptive statistics for all study variables
| N | M | SD | Range | |
|---|---|---|---|---|
| Maternal characteristics | ||||
| Education (years) | 88 | 14.66 | 2.21 | 10.00–18.00 |
| Depressive symptoms | 86 | 10.99 | 9.14 | 0.00–43.00 |
| Sleep disturbance | 71 | 6.86 | 3.67 | 1.00–16.00 |
| Infant cognition | ||||
| Bayley scaled score | 82 | 10.66 | 2.45 | 3.00–17.00 |
| Median looking time, seconds | 71 | 7.58 | 4.76 | 1.11–22.9 |
| Infant sleep consolidation | 80 | 0.00 | 0.83 | −2.14 to 2.31 |
| Longest sleep period (min) | 80 | 293.18 | 82.68 | 119.2–527.3 |
| Nighttime sleep ratio | 80 | 0.73 | 0.08 | 0.51–0.91 |
| Daytime naps (n) | 80 | 2.95 | 0.68 | 1.20–4.83 |
| Infant sleep regulation | 81 | 0.02 | 0.85 | −2.15 to 1.27 |
| Parental interventions | 81 | 2.07 | 1.87 | 0.00–8.00 |
| Self-soothed waking (proportion) | 76 | 0.32 | 0.39 | 0.00–1.00 |
| Nighttime wakefulness (proportion) | 81 | 0.06 | 0.06 | 0.00–0.26 |