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Table 3 Convergent and discriminant validity and internal consistency reliability for the Kiswahili version of the EORTC QLQ-C30

From: Health-related quality of life and needs of care and support of adult Tanzanians with cancer: a mixed-methods study

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