Table 2 Pittsburgh Sleep Quality Index (PSQI): component and global scores (n = 1092)

Component-1: Sleep quality

1.30 (1.03)

1.40 (1.02)

1.11 (1.02)

4.41

0.00

1 (1–2)

1(0–2)

7.05

.008

Component-2: Sleep latency

1.49 (0.96)

1.54 (0.97)

1.39 (0.94)

2.43

0.015

2 (1–2)

1 (1–2)

16.53

<.001

Component-3: Sleep duration

1.20 (1.08)

1.15 (1.09)

1.30 (1.06)

-2.17

0.03

1 (0–2)

2 (0–2)

6.10

.014

Component-4: Sleep efficiency

0.20 (0.52)

0.22 (0.56)

0.17 (0.43)

1.68

0.09

0

0

.31

.580

Component-5: Sleep disturbances

1.41 (0.68)

1.51 (0.67)

1.23 (0.65)

6.65

0.00

1 (1–2)

1 (1–2)

41.46

<.001

Component-6: Use of sleeping medication

0.46 (0.81)

0.53 (0.89)

0.32 (0.62)

4.65

0.00

0 (0–1)

0

7.90

.005

Component-7: Daytime dysfunction

0.81 (0.98)

0.88 (1.01)

0.68 (0.91)

3.21

0.00

1 (0–2)

0 (0–1)

9.23

.002

PSQI global score:

6.87 (3.80)

7.23 (3.86)

6.20 (3.57)

4.30

0.00

7 (4–9)

6 (4–8)

10.65

.001