Table 2. Bivariate relationships among polysomnographic and self-rated sleep measures, positive relations with others, plasma IL-6, and age.
| Sleep parameter | PSQI global score | Positive relations, cubed | Plasma IL-6, log | Age |
|---|---|---|---|---|
| Total sleep duration, trimmed | –0.03 | 0.12 | –0.11 | 0.04 |
| Sleep efficiency, cubed | –0.17 | 0.10 | –0.44* | –0.24† |
| Latency to sleep onset, trimmed | 0.24† | –0.19‡ | 0.23† | 0.06 |
| Latency to REM onset, trimmed | 0.01 | –0.18 | 0.17 | 0.03 |
| Percent NREM sleep | –0.21‡ | 0.02 | –0.31§ | –0.08 |
| Percent REM sleep | 0.12 | 0.07 | 0.01 | –0.09 |
| Percent body moving | 0.02 | –0.13 | –0.14 | –0.23† |
| PSQI global score | – | –0.30§ | 0.23† | 0.00 |
| Positive relations, cubed | –0.34§ | – | –0.31§ | 0.04 |
| Plasma IL-6 (log) | – | – | – | 0.33§ |
Data transformations are noted. *, P < 0.001; †, P < 0.05; ‡, P < 0.10; §, P < 0.01.