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Table 4 Comparison between the good and bad sleepers groups as regards polysomnographic variables

From: Sleep pattern in a group of patients undergoing hemodialysis compared to control

  Good sleeper Poor sleeper P value
Sleep onset latency 8.5 ± 8.8 15.1 ± 7.7 0.149
Sleep efficiency (%) 80.4 ± 6.8 62.9 ± 11.2 0.001
Sleep stage I (%) 7.5 ± 7.5 26.6 ± 28.4 0.033
Sleep stage II (%) 33.9 ± 17.6 38.0 ±13.6 0.623
SWS (%) 51.7 ± 24.0 31.6 ± 30.7 0.141
REM sleep (%) 6.9 ± 7.4 3.9 ± 5.4 0.399
REM latency (min) 222.0 ± 66.2 113.5 ± 99.5 0.012
Arousal index (h) 36.7 ± 15.6 30.1 ± 25.5 0.492
Sleep total apnea (h) 9.8 ± 8.3 10.0 ± 13.1 0.962
Sleep obstructive apnea (h) 5.0 ± 5.0 8.2 ± 11.0 0.375
Sleep central apnea (h) 1.7 ± 1.5 .8 ± 1.3 0.240
Mixed apnea (h) 3.2 ± 2.8 1.0 ± 1.7 0.122
SL hypopnea/h 22.4 ± 20.1 9.4 ± 14.5 0.196
Desaturations (h) 30.0 ± 24 21.4 ± 22.7 0.473
RDI 32.2 ± 26.1 19.4 ± 22.6 0.328
PLM Index 30.7 ± 23.2 23.1 ± 35.1 0.576
  1. Values are expressed as number (%) or as mean ± SD, as appropriate
  2. AHI apnea-hypopnea index, RDI respiratory disturbance index, PLM Index Periodic Limb Movements Index, REM rapid eye movement sleep, SWS slow-wave sleep