Skip to main content

Table 4 Polysomnographic results for the thirds of the night

From: Similar polysomnographic pattern in primary insomnia and major depression with objective insomnia: a sign of common pathophysiology?

 

Mean (SD) Whole sample (N = 209)

Mean (SD) Normative (N = 30)

Mean (SD) Insomnia (N = 84)

Mean (SD) Depression (N = 95)

Median (P25-P75) Normative (N = 30)

Median (P25-P75) Insomnia (N = 84)

Median (P25-P75) Depression (N = 95)

P-value

% REM

(p < 0.001)

(p < 0.001)

(p < 0.001)

(p < 0.001)

    

 1st third

6.97 ± 6.18

10.07 ± 5.23

6.52 ± 6.06

6.29 ± 6.34

10.14 (7.84–14.42)

5.81 (0.00–9.70)

5.76 (0.00–9.73)

<0.001a,b

 2nd third

17.62 ± 9.57

20.68 ± 10.02

17.37 ± 9.83

16.87 ± 9.11

19.67 (14.16–27.14)

17.80 (10.34–22.91)

17.26 (11.46–22.04)

0.242

 3rd third

20.62 ± 10.04

26.57 ± 8.32

20.30 ± 11.02

19.14 ± 9.02

27.17 (22.54–31.59)

19.69 (12.20–27.92)

19.20 (13.69–25.62)

0.001a,b

% Stage1

(p = 0.003)

(p < 0.001)

(p = 0.037)

(p = 0.172)

    

 1st third

6.10 ± 3.98

6.02 ± 3.33

6.29 ± 4.40

5.95 ± 3.81

5.07 (3.85–7.41)

5.78 (2.61–9.05)

6.00 (2.90–7.78)

0.971

 2nd third

5.76 ± 5.14

5.45 ± 2.92

5.47 ± 4.17

6.11 ± 6.34

4.90(3.10–7.17)

4.52 (2.26–8.55)

5.07 (2.89–7.43)

0.745

 3rd third

7.25 ± 7.19

7.91 ± 3.94

6.79 ± 4.43

7.45 ± 9.58

6.79 (4.80–10.09)

5.42 (3.81–8.89)

5.41 (3.68–9.20)

0.169

% Stage2

(p < 0.001)

(p < 0.001)

(p < 0.001)

(p < 0.001)

    

 1st third

39.04 ± 15.96

47.96 ± 10.26

38.99 ± 16.59

36.26 ± 15.97

50.32 (40.52–53.80)

39.33 (29.70–51.08)

38.94 (25.61–47.69)

0.001a,b

 2nd third

53.13 ± 15.33

61.00 ± 11.03

52.60 ± 13.76

51.12 ± 17.06

62.70 (53.86–70.07)

52.79 (47.07–62.95)

55.27 (42.16–63.73)

0.006a,b

 3rd third

43.48 ± 13.81

50.11 ± 9.72

40.57 ± 13.38

43.96 ± 14.60

49.87 (43.58–56.77)

42.11 (32.52–50.89)

45.38 (34.56–54.61)

0.003a

% SWS

(<0.001)

(<0.001)

(<0.001)

(<0.001)

    

 1st third

9.96 ± 10.41

20.53 ± 11.34

7.84 ± 8.90

8.50 ± 9.40

19.27 (10.61–29.14)

3.76 (0.26–13.21)

4.67 (0.62–15.36)

<0.001a,b

 2nd third

7.82 ± 9.97

7.24 ± 7.89

7.94 ± 10.92

7.89 ± 9.77

3.80 (0.93–10.31)

2.03 (0.00–12.52)

3.79 (0.20–12.04)

0.695

 3rd third

2.22 ± 4.61

2.37 ± 4.68

1.98 ± 4.60

2.39 ± 4.65

0.52 (0.00–1.92)

0 (0.00–1.75)

0.29 (0.00–2.75)

0.294

% WASO

(p < 0.001)

(p < 0.001)

(p < 0.001)

(p < 0.001)

    

 1st third

37.35 ± 21.33

15.41 ± 7.36

39.11 ± 19.65

42.94 ± 21.48

15.63 (10.09–19.07)

36.59 (27.74–50.01)

38.27 (26.94–55.45)

<0.001a,b

 2nd third

15.22 ± 18.32

5.63 ± 4.65

15.51 ± 16.80

17.98 ± 21.21

4.68 (2.81–8.10)

12.11 (4.58–19.59)

9.20 (5.42–23.62)

<0.001a,b

 3rd third

26.10 ± 18.39

12.27 ± 9.43

29.96 ± 18.57

27.05 ± 18.48

8.92 (5.24–15.51)

27.07 (18.18–41.55)

23.78 (13.95–37.67)

<0.001a,b

        

Kruskal-Wallis Test

  1. REM Rapid eye movement sleep, SWS slow-wave sleep, WASO wake after sleep onset
  2. After Bonferroni correction: aNormative vs Insomnia p < 0.05, bNormative vs Depression p < 0.05, cInsomnia vs Depression p < 0.05