Table 7

Stepwise multiple regression analysis of demographic, physiological, medical, and psychological variables in relation to PSQI

Independent

B

Standardized coefficients

t

P

R2(%)


Predictors

39.5

SDS

0.059

0.170

2.884

0.004

SAS

0.128

0.287

4.759

0.000

Nocturnal pain (VAS)

0.235

0.191

2.511

0.013

Total back pain (VAS)

0.210

0.157

2.027

0.044


PSQI, Pittsburgh Sleep Quality Index; SAS, Self-rating Anxiety Scale; SDS, Self-rating Depression Scale, VAS, visual analogue scale.

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

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