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Table 2 Circadian rest-activity pattern and sleep

From: The circadian rest-activity pattern predicts cognitive decline among mild-moderate Alzheimer’s disease patients

  Global
n=100
n (%) or median [p25;p75]
Rest-activity rhythm
 Interdaily stability 0.57 [0.49;0.63]
 Intradaily variability 0.80 [0.68;0.95]
 Relative amplitude 0.88 [0.84;0.92]
 M10 116 [83.6;151]
 L5 6.44 [4.48;9.93]
Sleep
 Time in bed, hours 8.98 [8.08;9.57]
 Total sleep time, hours 6.70 [5.54;7.56]
  < 7 h 56 (56.0%)
  7–9 h 39 (39.0%)
  > 9 h 5 (5.0%)
 Sleep efficiency, % 83.5 [78.1;88.4]
  ≥ 85% 44 (44.0%)
  84–75% 41 (41.0%)
  <  75% 15 (15.0%)
 Latency, minutes 22.0 [13.8;33.2]
  ≤ 30 min 69 (69.0%)
  31–60 min 25 (25.0%)
  >  60 min 6 (6.0%)
 WASO, minutes 39.4 [32.2;52.2]
  ≤ 30 min 20 (20.0%)
  >  30 min 80 (80.0%)
  1. L5 the mean activity of the five consecutive hours with the lowest activity, M10 the mean activity of the ten consecutive hours with the highest activity, n number, p percentile, WASO time spent awake after sleep onset