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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]
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