Table 4.
Polysomnography Sleep Duration as Predicted by other Sleep Measures according to Participant Characteristics, p <.10 for Interaction Terms
| Other Sleep Measure/Participant Characteristic | N | PSG Mean (SD) | Other Sleep Mean (SD) | Correlation (P-value) | Interaction Term (P-value) |
|---|---|---|---|---|---|
| Self-report habitual sleep | |||||
| Depressive symptoms | |||||
| Highest quartile | 56 | 6.14 (.98) | 6.32 (1.43) | −.03 (.85) | −.20 (.08) |
| Others | 159 | 6.08 (.98) | 6.51 (1.12) | .21 (.01) | |
| Hostility | |||||
| Highest quartile | 55 | 6.02 (.93) | 6.16 (1.29) | −.12 (.37) | −.28 (.02) |
| Others | 160 | 6.12 (.99) | 6.57 (1.16) | .22 (<.001) | |
| Actigraphy (nights 1–9) | |||||
| Insomnia | |||||
| Yes | 20 | 6.22 (1.32) | 5.84 (.85) | .57 (.01) | .56 (.03) |
| No | 195 | 6.09 (.94) | 5.78 (.90) | .31 (<.001) | |
| Variability in actigraphy duration (nights 1–9) | |||||
| Highest quartile | 55 | 6.00 (1.27) | 5.73 (.74) | .39 (<.001) | .35 (.06) |
| Others | 159 | 6.13 (.86) | 5.82 (.94) | .34 (<.001) | |
| Diary (nights 1–9) | |||||
| Race | |||||
| Black | 89 | 5.91 (1.04) | 6.42 (1.11) | .03 (.76) | .34 (.01) |
| White | 126 | 6.23 (.91) | 6.77 (.94) | .38 (<.001) | |
| Married/committed relationship | |||||
| No | 73 | 6.12 (1.17) | 6.58 (1.13) | .06 | .27 (.04) |
| Yes | 142 | 6.09 (.87) | 6.65 (.97) | .37 | |
| Hostility | |||||
| Highest quartile | 55 | 6.02 (.93) | 6.61 (1.14) | −.05 (.71) | −.38 (.01) |
| Others | 160 | 6.12 (.99) | 6.63 (.99) | .34 (<.001) | |
| Variability in diary duration (nights 1–9) | |||||
| Highest quartile | 54 | 5.92 (1.27) | 6.50 (1.20) | −.04 (.76) | −.40 (<.001) |
| Others | 161 | 6.16 (.86) | 6.67 (.96) | .39 (<.001) |