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Table 3 Prediction of responsiveness from internal consistency reliability

From: Internal consistency reliability is a poor predictor of responsiveness

Study Dependent variable Independent variables Constant Regression coefficient (p-value) R2
All studies SRM Cronbach's alpha 0.25 0.41 (0.59) 0.01
  SRM Cronbach's alpha 0.66 0.13 (0.83) 0.37
   Type of instrument*   -0.40 (0.01)  
Study 1 SRM Cronbach's alpha -0.09 0.90 (0.30) 0.07
  SRM Cronbach's alpha -0.07 1.04 (0.18) 0.32
   Type of instrument*   -0.25 (0.04)  
Study 2 SRM Cronbach's alpha 0.94 -0.64 (0.46) 0.03
  SRM Cronbach's alpha 0.52 -0.02 (0.98) 0.48
   Type of instrument*   -0.29 (<0.01)  
Study 3 SRM Cronbach's alpha -0.51 1.88 (0.11) 0.29
  SRM Cronbach's alpha 1.42 -0.45 (0.74) 0.60
   Type of instrument*   -0.59 (0.05)  
Study 4a SRM Cronbach's alpha -1.81 2.94 (0.013) 0.39
  SRM Cronbach's alpha -0.46 1.58 (0.15) 0.60
   Type of instrument*   -0.37 (0.03)  
Study 4b SRM Cronbach's alpha -2.61 3.52 (0.03) 0.32
  SRM Cronbach's alpha -0.43 1.36(0.22) 0.74
   Type of instrument*   -0.48 (<0.01)  
  1. SRM: standardised response mean
  2. * Disease-specific or generic