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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