Table 2 Sleep quality and its component scores among study participants

PSQI Score mean (±SD)

4.4 (SD= ±2.0)

Subjective sleep quality

  Very good

109

22.66

  Fairly good

349

72.56

  Fairly bad

19

3.95

  Very bad

4

0.83

Sleep latency

  0

188

39.09

  16-30 min

235

48.86

  31-60 minutes

48

9.98

  >60 minutes

10

2.08

Sleep duration

  More than 7 hours

358

74.43

  6-7 hours

102

21.21

  5-6 hours

19

3.95

  Less than 5 hours

2

0.42

Habitual sleep efficiency

  >85%

368

76.51

  75-84%

39

8.11

  65-74%

60

12.47

  <65%

14

2.91

Sleep disturbances

  0

45

9.36

  1 to 9

370

76.92

  10 to 18

62

12.89

  19 to 27

4

0.83

Use of sleeping medications

  Never

432

89.81

  Less than once a week

30

6.24

  1-2 times a week

14

2.91

  3 or more than 3 times a week

5

1.04

Daytime dysfunction

  0

157

32.64

  1 to 2

233

48.44

  3 to 4

85

17.67

  5 to 6

6

1.25