Table 7 Correlations between Measures of Nocturnal Sleep/Daytime Sleepiness and Quality of Life Scores
From: Nocturnal sleep, daytime sleepiness, and quality of life in stable patients on hemodialysis
Variable | Health & Functioning | Social & Economic | Psychological & Spiritual | Family | Total QLI |
|---|---|---|---|---|---|
Subjective measures (questionnaires) * | |||||
Typical sleep duration (n = 46) | -- | rs = 0.301 P = 0.022 | -- | -- | -- |
How often they had trouble : | Â | Â | Â | Â | Â |
• Falling asleep (n = 45) | rs = - 0.387 p = 0.004 | rs = - 0.402 p = 0.003 | rs = - 0.422 p = 0.002 | rs = - 0.497 p = 0.000 | rs = - 0.472 p = 0.001 |
• Waking up at night (n = 44) | -- | -- | -- | -- | -- |
• Waking up at night and not being able to get back to sleep (n = 45) | rs = - 0.426 p = 0.002 | rs = - 0.480 p = 0.000 | rs = - 0.373 p = 0.006 | rs = - 0.461 p = 0.001 | rs = - 0.496 ps = 0.000 |
How often they felt rested upon awakening in the morning (n = 46) | -- | rs = 0.325 p = 0.014 | rs = 0.319 p = 0.015 | -- | rs = 0.332 p = 0.012 |
Nocturnal kicking/twitching (n = 30) | -- | -- | -- | -- | -- |
Nocturnal gasping/choking (n = 41) | -- | -- | -- | -- | -- |
How often they napped (n = 46) | -- | -- | -- | -- | -- |
Epworth Sleepiness Scale (n = 46) | -- | -- | -- | -- | -- |
Objective Measures (polysomnography) ** | |||||
Total Sleep Time (min) | -- | -- | -- | -- | -- |
Sleep Efficiency (%) | -- | -- | -- | -- | -- |
Sleep Latency (min) | rs = 0.248 p = 0.048 | -- | -- | -- | -- |
RDI (events/hour) | -- | -- | -- | -- | -- |
PLMI (events/hour) | rs = -0.326 p = 0.013 | -- | -- | rs = -0.248 p = 0.048 | -- |
PLMs with arousal (event/hour) | rs = -0.247 p = 0.049 | -- | -- | -- | -- |
BAI (events/hour) | -- | -- | -- | -- | -- |
Mean Sleep Latency (min) | rs = 0.278 p = 0.030 | -- | -- | -- | rs = 0.263 p = 0.038 |