Table 2.

Sleep and activity characteristics of participants

Sleep CharacteristicControlCKDHDTotalP
n19 (7%)148 (53%)114 (41%)281 (100%)
Rest per day (min)465 ± 79457 ± 119458 ± 151458 ± 1311
Sleep onset latency (min/day)28 ± 2741 ± 5378 ± 7355 ± 64<0.0001
Snooze time (min/day)23 ± 2333 ± 4838 ± 4034 ± 440.3
Wake but rest per day (min)0 ± 01 ± 512 ± 555 ± 360.03
Active time per day (min)667 ± 280836 ± 210861 ± 195835 ± 214<0.01
Sleep per day (min)366 ± 67338 ± 96290 ± 112320 ± 105<0.001
Sleep/rest time (%)78.8 ± 7.974.8 ± 12.663.3 ± 17.670.4 ± 15.8<0.0001
WASO (min/day)70 ± 3174 ± 4779 ± 6776 ± 550.7
Naps (number/day)0.2 ± 0.30.4 ± 0.60.4 ± 0.60.4 ± 0.60.4
Sleep <5 h/night2 (11%)46 (31%)60 (53%)108 (38%)<0.0001
Sleep efficiency (%)74.1 ± 8.967.6 ± 16.854.4 ± 21.062.7 ± 19.5<0.0001
Time mobile during sleep/day (min)57.1 ± 29.886.6 ± 57.6126.4 ± 84.8100.8 ± 72.1<0.0001
Fragmentation index16.8 ± 6.924.7 ± 10.734.1 ± 16.228.0 ± 14.1<0.0001
Subjective quality of sleep
    overall sleep quality60.6 ± 28.959.2 ± 25.355.8 ± 24.857.9 ± 25.30.6
    sleep maintenance65.0 ± 33.161.9 ± 28.255.8 ± 33.659.7 ± 30.80.3
    sleep sufficiency52.5 ± 39.251.8 ± 30.644.7 ± 30.149.0 ± 31.10.2
    daytime somnolence71.3 ± 37.964.7 ± 28.773.8 ± 25.768.8 ± 28.40.05
    sleep quality (KDQOL score)62.3 ± 25.659.4 ± 21.257.5 ± 19.158.8 ± 20.70.6
  • HD, hemodialysis.