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Table 5 Multiple regression models with backward elimination for participants (n = 105, control and intervention groups) with the Shoulder Pain and Disability Index (SPADI) at 8 weeks and change in SPADI from baseline to 8 weeks as dependent variables

From: Predicting outcome in frozen shoulder (shoulder capsulitis) in presence of comorbidity as measured with subjective health complaints and neuroticism

  Initial model Final model
  B p-value R2 B p-value R2
SPADI at 8 weeks    0.30    0.29
 SHC Pseudoneurology baseline 2.4 0.001   2.6 < 0.001  
 Gender (male = 0; female = 1) 0.78 0.85     
 Age − 0.36 0.15     
 Group allocation (control = 0; intervention = 1) − 25.1 < 0.001   − 24.8 < 0.001  
Change in SPADI from baseline to 8 weeks    0.36    0.36
 SHC Pseudoneurology baseline 0.19 0.77     
 Gender (male = 0; female = 1) 11.78 0.002   11.99 0.002  
 Age 0.48 0.04   0.47 0.04  
 Group allocation (control = 0; intervention = 1) 19.50 < 0.001   19.73 < 0.001  
 Shoulder pain duration 0.93    0.91 0.013