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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.