Reliability and validity of Amharic version of EORTC QLQ-C30 and QLQ-BR23 modules for assessing health-related quality of life among breast cancer patients in Ethiopia

Table 3 Multi-trait scale analysis for convergent and divergent validity of EORTC QLQ-C30 and QLQ-BR23 Amharic version in women with breast cancer in Ethiopia (n = 146)

EORTC QLQ-C30		Item-own scale correlations^b	Item-other scale correlations^b	Scaling success
Scale	Sub-scale	Item-own scale correlations^b	Item-other scale correlations^b	Scaling success
Overall Quality of life	Global Health Status	0.887–0.909	0.091–0.589	2/2
	Physical	0.442–0.870	0.013–0.572	5/5
	Role	0.958–0.959	0.12–0.639	2/2
Functional scales	Emotional	0.647–0.838	0.008–0.582	4/4
	Cognitive	0.753–0.800	0.025–0.487	2/2
	Social	0.874–0.898	0.041–0.439	2/2
Symptoms scales	Fatigue	0.830–0.880	0.164–0.629	3/3
	Nausea and vomiting	0.769–0.999	0.029–0.377	2/2
	Pain	0.870–0.892	0.116–0.634	2/2
EORTC QLQ-BR23
Functional scales	Body Image	0.695–0.854	0.026–0.384	4/4
Functional scales	Sexual functioning	0.961–0.969	0.005–0.029	2/2
Symptoms scales	Therapy’s side effects^a	0.337–0.7880.636–0.800	0.006–0.534	7/7
	Breast symptoms	0.337–0.7880.636–0.800	0.009–0.636	4/4
	Arm symptoms	0.604–0.856	0.031–0.614	3/3

^aSystemic therapy side effects, and hair loss correlation with systemic therapy side effect is 0.337 which is below 0.4
^bSpearman correlation coefficients

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