Table 4.
Factors which could influence the patients' estimates of their sleep quality and/or alertness in the daytime. Only statistically significant (p < 0.05 or p < 0.01 marked by asterisks) correlation coefficients are displayed.
| NIGHT RECORDING | DAY TIME RECORDING | ||||||||||
| Sleep latency | Sleep stage 1 (%) | Sleep stage 2 (%) | Sleep st.3+4 (%) | REM sleep (%) | Sleep efficacy | Total sleep time | Sleep stage 0–2 (visual an.) | Alpha amplitude (spectrum an.) | |||
| mean | trend | mean | trend | ||||||||
| Age | -.46 | ||||||||||
| Coffee (>2 cups/day) | |||||||||||
| Smoking (>10 cig./day) | |||||||||||
| Alcohol (>0.5 l wine or >0.1 l distilate/week) | .47 | .46 | |||||||||
| Hypnotics (>3 times/week) | -.68* | ||||||||||
| Sedatives (>3 times/week) | |||||||||||
| Antidepressants (daily) | |||||||||||
| Unexpected event last week | -.54* | ||||||||||
| Too active going to bed | |||||||||||
| Disturbed by the examination | |||||||||||
| Beck: score for depression | |||||||||||
| Beck: score for anxiety | .54* | -.65* | .55* | -.65* | |||||||