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] |