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