Skip to main content

Table 5 Observed means and standard deviations for the groups at each time point, with medians and 25th and 76th percentiles reported for non-normal data

From: Ambient bright light treatment improved proxy-rated sleep but not sleep measured by actigraphy in nursing home patients with dementia: a placebo-controlled randomised trial

  Intervention group Control group
Baseline Week 8 Week 16 Week 24 Baseline Week 8 Week 16 Week 24
SE Mean (SD) 75.0 (18.6) 74.8 (14.5) 76.5 (15.7) 71.8 (18.8) 72.4 (16.3) 70.3 (15.4) 69.2 (13.4) 71.7 (15.2)
  Median (25th–75th) 80.2 (67.0–90.8) 76.9 (67.7–88.5) 80.0 (70.7–89.1) 76.6 (58.1–87.0) 79.0 (59.0–87.5) 75.7 (55.3–81.3) 70.2 (60.7–79.4) 72.4 (60.5–84.2)
TST night Mean (SD) 359.9 (89.3) 358.8 (69.6) 367.0 (75.3) 344.5 (90.0) 347.6 (78.3) 339.2 (75.2) 332.0 (64.3) 344.1 (73.2)
  Median (25th–75th) 385.1 (321.4–432.1) 368.3 (324.9–425.0) 383.4 (240.0–427.7) 367.6 (278.6–415.2) 379.1 (283.1–419.9) 364.4 (265.6–394.7) 336.9 (291.3–381.3) 347.4 (290.6–404.3)
TST 24 h Mean (SD) 623.3 (162.0) 623.3 (162.0) 597.7 (137.3) 626.2 (179.7) 669.2 (182.7) 655.5 (157.1) 646.2 (152.9) 664.6 (186.4)
TST day Mean (SD) 125.4 (70.3) 119.9 (73.0) 141.2 (100.2) 137.1 (82.3) 176.2 (93.1) 150.0 (91.5) 159.0 (90.9) 154.5 (88.6)
WASO Mean (SD) 58.8 (32.4) 65.7 (36.4) 56.3 (23.7) 75.3 (48.7) 76.3 (50.0) 73.4 (43.5) 73.6 (33.7) 71.7 (39.1)
SDI Mean (SD) 10.3 (14.9) 8.0 (8.8) 7.7 (12.3) 6.9 (10.7) 10.0 (12.8) 19.2 (21.3) 10.8 (10.5) 9.4 (10.3)
  Median (25th–75th) 3.0 (0.0–13.0) 5.5 (1.5–12.0) 2.0 (0.0–12.0) 2.0 (0.0–10.0) 3.0 (0.0–18.0) 12.0 (2.0–32.0) 5.5 (2.0–21.0) 5.0 (3.0–14.0)
  Proportion with sleep problems, n (%)* 12 (40.0) 11 (47.8) 8 (40.0) 8 (33.3) 14 (45.2) 12 (44.4) 14 (60.9) 12 (54.5)
  1. *Sleep problems defined as sleep efficiency < 75%
  2. SE sleep efficiency, SD standard deviation, SDI Sleep Disorder Inventory, TST total sleep time, WASO wake after sleep onset