Assessing the acceptability, reliability, and validity of the EORTC Quality of Life Questionnaire (QLQ-C30) in Kenyan cancer patients: a cross-sectional study

Journal of Patient-Reported Outcomes

Table 2 Scores and Cronbach’s Alpha-Coefficient Values for Each Scale/Item in the EORTC QLQ-C30

Scale/Items	Item No.^a	Mean (SD)	Cronbach’s alpha
Global health status/QOL (GL)	29, 30	53 (27)	0.95
Functional Scales^b
Physical (PF)	1–5	63 (28)	0.86
Role (RF)	6, 7	55 (35)	0.87
Emotional (EF)	21–24	68 (28)	0.72
Cognitive (CF)	20, 25	63 (32)	0.37
Social (SF)	26, 27	51 (36)	0.75
Symptom Scales^c
Fatigue (FA)	10, 12, 18	49 (32)	0.85
Nausea and vomiting (NV)	14, 15	36 (34)	0.85
Pain (PA)	9, 19	54 (35)	0.83
Dyspnoea (DY)	8	19 (32)	–
Sleep disorders (SL)	11	35 (38)	–
Appetite loss (AP)	13	50 (39)	–
Constipation (CO)	16	30 (35)	–
Diarrhea (DI)	17	12 (24)	–
Financial impact (FI)	28	79 (31)	–

Cronbach’s alpha values > 0.70 indicate adequate scale reliability
EORTC QLQ-C30 European Organization for Research and Treatment of Cancer QOL measure
^aItem numbers on the QLQ-C30
^bScores range from 0 to 100, with a higher score representing a higher level of functioning
^cScores range from 0 to 100, with a higher score representing a higher level of symptoms