Table 3 Convergent and discriminant validity and internal consistency reliability for the Kiswahili version of the EORTC QLQ-C30
Scales | No items per scale | Floor/ceiling effects (%) | Convergent validity (range of correlations) | Discriminative validity (range of correlations) | Scaling success (% rate) | Reliability (α) |
|---|---|---|---|---|---|---|
Physical function | 5 | 0/1.0 | 0.41-0.62 | 0.05-0.62 | 36/40 (90%) | 0.76 |
Role function | 2 | 15.5/17.5 | 0.71 | 0.08-0.64 | 16/16 (100%) | 0.83 |
Emotional function | 4 | 1.9/27.2 | 0.53-0.77 | 0.09-0.50 | 32/32 (100%) | 0.82 |
Cognitive function | 2 | 1.0/15.5 | 0.20 | 0.12-0.53 | 3/16 (19%) | 0.33 |
Social function | 2 | 21.4/12.6 | 0.57 | 0.01-0.46 | 16/16 (100%) | 0.73 |
Global health/QOL | 2 | 2.9/0 | 0.41 | 0.08-0.52 | 10/16 (63%) | 0.58 |
Fatigue | 3 | 4.9/8.7 | 0.36-0.66 | 0.12-0.73 | 18/24 (79%) | 0.71 |
Nausea/vomiting | 2 | 37.9/5.8 | 0.63 | 0.00-0.31 | 16/16 (100%) | 0.77 |
Pain | 2 | 4.9/13.6 | 0.46 | 0.11-0.59 | 9/16 (56%) | 0.63 |