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Table 3 Pittsburgh Sleep Quality Index: scores and components’ descriptive analyses

From: Sleep disturbances in obsessive-compulsive disorder: influence of depression symptoms and trait anxiety

PSQI component

Score 0

Score 1

Score 2

Score 3

Statistic ͣ

df

P value

OCD

HC

OCD

HC

OCD

HC

OCD

HC

N

(%)

N

(%)

N

(%)

N

(%)

N

(%)

N

(%)

N

(%)

N

(%)

Subjective sleep quality

14 (23%)

35 (35%)

24 (39.3%)

54 (54%)

16 (26.2%)

8 (8%)

7 (11.5%)

3 (3%)

X2 = 11.98

3

0.001*

Sleep latency

16 (26.2%)

36 (36%)

15 (24.6%)

42 (42%)

11 (18%)

19 (19%)

19 (31.1%)

3 (3%)

X2 = 15.38

3

< 0.001*

Sleep duration

36 (59%)

66 (66%)

15 (24.6%)

25 (25%)

6 (9.8%)

7 (7%)

4 (6.6%)

2 (2%)

X2 = 2.12

3

0.145

Habitual sleep efficiency

32 (52.5%)

61 (61%)

13 (21.3%)

25 (25%)

8 (13.1%)

7 (7%)

8 (13.1%)

7 (7%)

X2 = 2.85

3

0.091

Sleep disturbance

1 (1.6%)

6 (6%)

31 (50.8%)

78 (78%)

25 (41%)

16 (16%)

4 (6.6%)

0 (0%)

X2 = 20.60

3

< 0.001*

Use of sleeping medication

35 (57.4%)

86 (86%)

4 (6.6%)

8 (8%)

2 (3.3%)

2 (2%)

20 (32.8%)

4 (4%)

X2 = 24.23

3

< 0.001*

Daytime dysfunction

11 (18%)

51 (51%)

20 (32.8%)

41 (41%)

17 (27.9%)

7 (7%)

13 (21.3%)

1 (1%)

X2 = 38.25

3

< 0.001*

  1. Abbreviations: OCD Obsessive-Compulsive Disorder, HC Healthy Controls, PSQI Pittsburgh Sleep Quality Index
  2. ͣ X2 for a linear trend. *P < 0.05