Table 3

Comparison of the components of PSQI in cases and controls

PSQI components score

Cases

n = 314

Controls

n = 102

P value


Subjective sleep quality

1.01 ± 0.77

0.89 ± 0.79

0.127

Sleep latency

0.98 ± 0.89

0.69 ± 0.88

0.001

Sleep duration

0.68 ± 0.79

1.29 ± 0.86

0.000

Habitual sleep efficiency

0.95 ± 1.03

0.25 ± 0.64

0.000

Sleep disorders

1.21 ± 0.69

0.74 ± 0.63

0.000

Use of sleep medications

0.10 ± 0.46

0.01 ± 0.09

0.055

Daytime dysfunction

1.69 ± 0.95

1.63 ± 1.00

0.635

Total

6.62 ± 3.62

5.50 ± 2.51

0.020


P values were obtained with the Mann-Whitney U test. PSQI, Pittsburgh Sleep Quality Index.

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

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