Table II.
Actigraphy Sleep and Sleep Diary in Parent–Child Dyads
| Variables | Mean (SD) |
Group fixed effects |
|||||
|---|---|---|---|---|---|---|---|
| TD | JIA | b | SE | t | p | Cohen’s d | |
| Actigraphy child sleep | |||||||
| Sleep onset | 21:17 (0:50) | 21:14 (1:08) | −0.02 | 0.26 | −0.07 | .94 | 0.02 |
| Sleep offset | 7:24 (0:46) | 7:06 (1:03) | −0.34 | 0.24 | −1.41 | .16 | 0.54+ |
| TST (min) | 509 (42) | 483 (72) | −30.65 | 13.89 | −2.21 | .03* | 0.86++ |
| WASO (min) | 82 (24) | 93 (36) | 10.97 | 5.91 | 1.86 | .06 | 0.69+ |
| SE (%) | 84.84 (3.75) | 82.53 (6.05) | −2.51 | 1.14 | −2.2 | .03* | 0.84++ |
| Daytime nap (min) | 19 (37) | 63 (49) | 23.94 | 9.51 | 2.52 | .01** | 1.72++ |
| 24-hr sleep (min) | 528 (52) | 546 (76) | −2.04 | 19.85 | −0.1 | .92 | 0.35 |
| Diary child sleep | |||||||
| Bedtime | 21:01 (0:47) | 21:01 (1:04) | 0.09 | 0.25 | 0.34 | .74 | 0.22 |
| Wake time | 7:24 (0:36) | 7:11 (0:59) | −0.24 | 0.21 | −1.15 | .25 | 0.36 |
| Sleep duration (min) | 623 (47) | 610 (62) | −20.66 | 15.75 | −1.31 | .19 | 0.62+ |
| SQ | 7.80 (1.54) | 6.98 (2.23) | −0.63 | 0.61 | −1.04 | .3 | 0.46 |
| Actigraphy parent sleep | |||||||
| Sleep onset | 23:43 (1:06) | 22:56 (1:34) | −0.86 | 0.37 | −2.35 | .02* | 0.89++ |
| Sleep offset | 7:27 (1:05) | 7:01 (1:10) | −0.33 | 0.3 | −1.13 | .26 | 0.44 |
| TST (min) | 397 (65) | 404 (77) | 4 | 18.04 | 0.22 | .82 | 0.16 |
| WASO (min) | 48 (19) | 67 (41) | 20.02 | 8.33 | 2.4 | .02* | 0.92++ |
| SE (%) | 87.81 (4.47) | 84.28 (6.93) | −3.76 | 1.63 | −2.3 | .02* | 0.88++ |
| Diary parent sleep | |||||||
| Bedtime | 23:30 (1:05) | 22:52 (1:20) | −0.67 | 0.29 | −2.31 | .02* | 0.88++ |
| Wake time | 6:55 (0:57) | 6:46 (1:01) | −0.21 | 0.25 | −0.84 | .40 | 0.31 |
| Sleep duration (min) | 444 (76) | 475 (86) | 31.89 | 18.11 | 1.76 | .08 | 0.72+ |
| SQ | 6.54 (1.47) | 5.74 (2.08) | −0.29 | 0.53 | −0.54 | .59 | 0.56+ |
Note. TD = typically developing; JIA = juvenile idiopathic arthritis; TST = total sleep time; WASO = wake after sleep onset; SE = sleep efficiency; min = minutes; SQ = sleep quality reported in sleep diary; bedtimes and wake times are presented as 24-hr clock.
Group fixed effect was entered as TD-0, JIA-1; child age was entered as a fixed effect.
Cohen’s d was calculated based on the individual sleep data averaged across the study period; +medium effect size, ++large effect size.
*p < .05, **p < .01.