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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 :      
• 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
  1. *those subjects who responded that "don't know" (0) were excluded from the analysis, **all analyses include all subjects (n = 46)