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Table 2 Comparison between cases and control as regards the sleep study findings (polysomnographic variables)

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

  Cases Control P value
Sleep onset latency 13.3 ± 8.42 15.6 ± 2.29 0.213
Sleep efficiency (%) 68.13 ± 12.85 91.35 ± 1.35 0.000
Sleep stage I (%) 20.85 ± 25.41 3.15 ± .68 0.003
Sleep stage II (%) 36.76± 14.56 50.33 ± .43 0.000
SWS (%) 37.60 ± 29.75 22.63 ± .93 0.030
REM sleep (%) 4.80 ± 6.02 26.47 ± 11.40 0.000
REM latency (min) 146.08 ± 102.62 70.60 ± 5.75 0.002
Arousal index (h) 32.08 ± 22.73 .89 ± 1.03 0.000
Sleep total apnea (h) 9.95 ± 11.61 .06 ± .12 0.000
Sleep obstructive apnea (h) 7.23 ± 9.59 .05 ± .11 0.002
Sleep central apnea (h) 1.02 ± 1.38 0  
Mixed apnea (h) 1.66 ± 2.24 .01 ± .02 0.002
AHI/h 13.31 ± 16.98 .02 ± .05 0.001
Desaturations (h) 23.95 ± 22.85 .03 ± .07 0.000
RDI 23.26 ± 23.79 .07 ± .15 0.000
PLM Index 25.37 ± 31.59 .25 ± .31 0.001
  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