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Table 7 Stepwise multiple regression analysis of demographic, physiological, medical, and psychological variables in relation to PSQI

From: Sleep disturbances are associated with increased pain, disease activity, depression, and anxiety in ankylosing spondylitis: a case-control study

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