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Table 3 Convergent (discriminant)validity. Mutitrait-multimethod (MTMM) correlation matrix illustrating the correlation of the different measures at baseline, missing data excluded pairwise for each comparison (n = 488)

From: An empirical evaluation of the SF-12, SF-6D, EQ-5D and Michigan Hand Outcome Questionnaire in patients with rheumatoid arthritis of the hand

  MHQ (overall) MHQ (hand function both) EQ-5D (utility) EQ-5D (VAS) SF-12 (PCS) SF-12 (MCS) SF-6D
MHQ 1       
EQ-5D (utility) 0.65 0.48 1     
EQ-5D (VAS) 0. 51 0. 42 0. 57 1    
SF-12 (PCS) 0. 59 0. 46 0. 61 0. 56 1   
SF-12 (MCS) 0. 32 0. 23 0. 42 0. 40 0. 25 1  
SF-6D 0.63 0.42 0.68 0.58 0.70 0.67 1
  1. Correlation coefficients (spearman’s rho). All correlations are statistical significance (p < 0.01). Values in bold indicate correlations expected to exceed 0.7 (convergent validity)