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Table 4 Interscale correlation matrices* for VAS/Likert-type methods

From: Validation of a general measure of treatment satisfaction, the Treatment Satisfaction Questionnaire for Medication (TSQM), using a national panel study of chronic disease

  Effectiveness (EFFECT) Side effects (SIDEF) Convenience (CONV)
  VAS** Likert*** VAS** Likert*** VAS** Likert***
Effectiveness 1.00 1.00     
Side effects .23 .37 1.00 1.00   
Convenience .22 .36 .33 .35 1.00 1.00
Global Satisfaction .60 .72 .36 .43 .41 .48
  1. * Spearman correlations are significant at the .0001 level (2-tailed); **VAS sample (n = 287); ***Likert type sample (n = 280)