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Table 3 Internal consistency and reliability of the EORTC QLQ-C30

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

 

Cronbach’s α

Reliability ICC (IC 95%)

Inter-ratter

Test-retest

Physical functioning

0.84

0.92 [0.88-0.94]

0.89 [0.85-0.93]

Role functioning

0.94

0.82 [0.75-0.87]

0.80 [0.71-0.87]

Emotional functioning

0.89

0.82 [0.76-0.87]

0.82 [0.74-0.88]

cognitive functioning

0.34

0.83 [0.77-0.88]

0.72 [0.61-0.81]

Social functioning

0.80

0.78 [0.69-0.84]

0.64 [0.50-0.75]

Global health status

0.87

0.84 [0.78-0.89]

0.76 [0.66-0.84]

Fatigue

0.83

0.82 [0.75-0.87]

0.84 [0.76-0.89]

Nausea and vomiting

0.74

0.83 [0.77-0.88]

0.78 [0.67-0.85]

Pain

0.78

0.90 [0.86-0.93]

0.82 [0.74-0.88]

Dyspnoea

-

0.78 [0.68-0.84]

0.78 [0.68-0.85]

Insomnia

-

0.73 [0.63-0.81]

0.74 [0.62-0.82]

Appetite loss

-

0.83 [0.77-0.88]

0.75 [0.65-0.83]

Constipation

-

0.89 [0.85-0.92]

0.82 [0.73-0.88]

Diarrhoea

-

0.78 [0.70-0.84]

0.75 [0.64-0.83]

Financial difficulties

-

0.74 [0.65-0.81]

0.80 [0.71-0.87]