Table 3.
Change in outcome variables at each SKIP time point.
| Outcome | Baseline Mean (SD) | Postintervention Δ from Baseline (95% CI) | d | 12-Week Follow-Up Δ from Baseline (95% CI) | d | |
|---|---|---|---|---|---|---|
| Child | Sleep time (min) | 479 (74) | 26.6 (15.9 to 37.4)c | 0.31 | 7.5 (−3.5 to 18.5) | 0.12 |
| WASO (min) | 109 (64) | −27.1 (−34.2 to −19.8)c | 0.72 | −37.1 (−44.5 to −29.7)c | 1.01 | |
| Sleep efficiency (%) | 82 (10) | 4.3 (3.2 to 5.5)c | 0.69 | 5.4 (4.2 to 6.5)c | 0.94 | |
| Bedtime range (min) | 171 (104) | −34.9 (−42.5 to −27.4)c | 0.37 | −35.2 (−42.9 to −27.5)c | 0.47 | |
| Bedtime CV | 0.12 (0.18) | 0.01 (−0.02 to 0.03) | 0.12 | −0.02 (−0.05 to 0.00) | 0.12 | |
| Parent | Sleep time (min) | 421 (78) | 14.7 (1.3 to 28.1)a | 0.32 | 6.5 (−7.5 to 20.4) | 0.10 |
| WASO (min) | 70 (40) | −9.8 (−15.3 to −4.4)c | 0.45 | −13.9 (−19.5 to −8.2)c | 0.68 | |
| Sleep efficiency (%) | 86 (7) | 2.0 (1.0 to 7.9)c | 0.51 | 2.7 (1.7 to 3.7)c | 0.74 | |
| Bedtime range (min) | 223 (168) | −26.0 (−40.8 to −11.2)b | 0.07 | −35.3 (−51.0 to −19.7)c | 0.60 | |
| Bedtime CV | 0.33 (0.33) | 0.00 (−0.05 to 0.05) | 0.00 | −0.20 (−0.25 to −0.15)c | 0.61 |
Effect size magnitude: 0.2 = small, 0.5 = moderate, 0.8 = large. aP < .05; bP < .01, cP < .001. CI = confidence interval, CV = coefficient of variation, d = Cohen’s d, SD = standard deviation, WASO = wake after sleep onset, Δ = change.