Table 2 Changes in subjective and objective sleep variables across three time points in the TG (N = 14) and CG (N = 11).

From: Positive effect of timed blue-enriched white light on sleep and cognition in patients with mild and moderate Alzheimer’s disease

 

TG

CG

Mean (SD)

Mean (SD)

Subjective sleep

PSQI

 T0

11.36 ± 4.57

11.00 ± 3.71

 T1

6.71 ± 4.25

9.36 ± 4.78

 T2

5.79 ± 4.44

9.27 ± 4.45

Objective sleep

SO (h:m)

 T0

21:54 ± 1.56

22:00 ± 1.42

 T1

21:51 ± 1.51

22:21 ± 1.44

 T2

21:52 ± 1.28

22:17 ± 1.33

MST (h:m)

 T0

02:17 ± 1.08

02:00 ± 1.19

 T1

02:13 ± 0.97

01:54 ± 1.65

 T2

01:39 ± 2.09

02:01 ± 0.83

SOL (min)

 T0

22.20 ± 17.12

25.80 ± 26.30

 T1

16.92 ± 12.38

34.25 ± 25.60

 T2

14.88 ± 10.72

23.89 ± 19.24

TST (h:m)

 T0

07:13 ± 2.16

05:55 ± 1.34

 T1

07:25 ± 1.06

05:12 ± 1.66

 T2

07:24 ± 1.76

05:14 ± 1.35

SE (%)

 T0

78.69 ± 11.75

70.16 ± 7.28

 T1

83.43 ± 6.19

67.42 ± 14.45

 T2

80.81 ± 11.67

67.26 ± 12.36

WASO (min)

 T0

60.30 ± 35.07

86.89 ± 26.07

 T1

54.29 ± 26.98

80.27 ± 30.84

 T2

60.68 ± 34.03

100.38 ± 47.46

FI

  

 T0

35.64 ± 14.79

47.93 ± 9.66

 T1

32.53 ± 12.25

50.91 ± 19.40

 T2

38.54 ± 19.02

47.25 ± 18.46

  1. T0 baseline, T1 immediate post-treatment, T2 4 weeks after the end of the 2 weeks of light treatment, PSQI Pittsburgh Sleep Quality Index, SO sleep onset, MST Mid-sleep time, SOL sleep onset latency, TST total sleep time, SE sleep efficiency, WASO wake after sleep onset, FI fragmentation index.
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