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Table 3 Correlations between daily physical activity and clinical assessments in patients with ankylosing spondylitis

From: Daily physical activity in ankylosing spondylitis: validity and reliability of the IPAQ and SQUASH and the relation with clinical assessments

  IPAQ (MET-minutes/week) SQUASH Accelerometer (kcounts/day)
Number of patients 86a 94a 55b
Disease activity    
   BASDAI (range 0 to 10)c -0.220*d -0.326**d NS
   ESR (mm/hour)c NS NS -0.460***d
   CRP (mg/l)c NS NS -0.289*d
   ASDASCRPc -0.243*d -0.311**d -0.283*d
Physical function    
   BASFI (range 0 to 10)c -0.387***d -0.476***e -0.274*e
Spinal mobility    
   Occiput-to-wall distance (cm)c NS -0.297**d NS
   Chest expansion (cm)f NS NS NS
   Modified Schober test (cm)f NS 0.260*d 0.338*d
   Lateral spinal flexion (cm)f NS NS 0.369*e
   Cervical rotation (degrees)f NS 0.306**d 0.320**d
Quality of life    
   ASQoLc -0.282**d -0.500***d -0.356**d
  1. ASDAS, ankylosing spondylitis disease activity score; ASQoL, ankylosing spondylitis quality of life; BASDAI, Bath ankylosing spondylitis disease activity index; BASFI, Bath ankylosing spondylitis functional index; CRP, C-reactive protein; ESR, erythrocyte sedimentation rate; IPAQ, International Physical Activity Questionnaire; MET, metabolic equivalent; NS, nonsignificant; SQUASH, Short QUestionnaire to Assess Health-enhancing physical activity. aOnly patients with complete data on the first IPAQ or SQUASH assessment and available clinical data were included. bOnly patients with complete accelerometer data and available clinical data were included. cLower score represents lower disease activity or better physical function, spinal mobility or quality of life.dSpearman's correlation coefficient. ePearson's correlation coefficient. fHigher score represents better spinal mobility. *Statistically significant correlation (P < 0.05). **Statistically significant correlation (P < 0.01). ***Statistically significant correlation (P < 0.001).