Table 2

Descriptive statistics on the components of PSQI in cases

PSQI components score

0

1

2

3

Subjective sleep quality, n (%)

78 (24.8)

166 (52.9)

58 (18.5)

12 (3.8)

Sleep latency, n (%)

103 (32.8)

139 (44.3)

46 (14.6)

26 (8.3)

Sleep duration, n (%)

155 (49.4)

117 (37.3)

31 (9.9)

11 (3.5)

Habitual sleep efficiency, n (%)

136 (43.3)

98 (31.2)

41 (13.1)

39 (12.4)

Sleep disorders, n (%)

39 (12.4)

181 (57.6)

84 (26.8)

10 (3.2)

Use of sleep medications, n (%)

297 (94.6)

8 (2.5)

4 (1.3)

5 (1.6)

Daytime dysfunction, n (%)

35 (11.1)

98 (31.2)

109 (34.7)

72 (22.9)

N = 314.

Li et al. Arthritis Research & Therapy 2012 14:R215   doi:10.1186/ar4054