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Table 4 Multitrait scaling analysis of the EORTC QLQ-C30 questionnaire (Moroccan Arabic Version)

From: Translation and validation of European organization for research and treatment of cancer quality of life Questionnaire -C30 into Moroccan version for cancer patients in Morocco

Scales Item convergent validity (item-own scale correlation) Item convergent validity scaling succesa Item discriminant validity scaling succesb
Physical functioning 0.72-0.86 5/5 40/40
Role functioning 0.98-0.98 2/2 16/16
Emotional functioning 0.85-0.89 4/4 32/32
cognitive functioning 0.73-0.82 2/2 16/16
Social functioning 0.89-0.92 2/2 16/16
Global health status 0.94-0.94 2/2 16/16
Fatigue 0.81-0.89 3/3 20/24
Nausea and vomiting 0.89-0.90 2/2 16/16
Pain 0.90-0.93 2/2 16/16
  1. aNumber of item-scale correlations greater than 0.40/total number of item-scale correlations.
  2. bnumber of correlations of items with own scales significantly higher than correlations with other scale/total number of correlations.
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