Psychometric performance of the Arabic versions of the Functional Assessment of Cancer Therapy-Breast plus Arm morbidity (FACT-B + 4) in patients with breast cancer related lymphedema: cross-sectional study

Table 3 Cronbach alpha, Intraclass correlation coefficient, SEM and MDC and their corresponding 95% CI for the participants with BCRL

Subscales	Internal consistency α	FACT-B + 4 (Time 1)	FACT-B + 4 (Time 2)	P value	ICC	95% CI for ICC_2,1	SEM	MDC₉₅	95% CI for MDC₉₅
PWB (7; 0–28)	0.84	19.70 ± 6.68	18.79 ± 5.66	0.50*	0.87	0.76–0.93	2.23	6.18	− 5.27 to 7.09
SWB (7; 0–28)	0.74	23.25 ± 5.38	23.12 ± 5.74	0.82*	0.79	0.62–0.89	2.54	7.06	− 6.65 to 7.47
EWB (6; 0–24)	0.75	21.05 ± 2.90	20.76 ± 2.83	0.23*	0.87	0.77–0.93	1.03	2.41	− 2.12 to 2.70
FWB (7; 0–28)	0.80	23.38 ± 3.75	23.32 ± 3.33	0.90*	0.72	0.67–0.85	1.87	5.20	− 5.14 to 5.26
BC 10 (10; 0–40)	0.75*	24.35 ± 6.61	23.94 ± 5.69	0.46*	0.86	0.74–0.93	2.31	6.39	− 5.98 to 6.80
ARM (5; 0–20)	0.84	10.85 ± 5.39	10.47 ± 5.58	0.23*	0.94	0.89–0.97	1.34	3.72	− 4.1 to 3.34
FACT-B TOI (24; 0–96)	0.85	67.44 ± 13.23	66.05 ± 11.18	0.42*	0.89	0.80–0.94	4.06	11.25	− 9.87 to 12.63
FACT-G (27; 0–108)	0.87	87.40 ± 14.17	86.00 ± 12.13	0.37*	0.92	0.84–0.96	3.73	10.34	− 8.94 to 11.74
FACT-B (37; 0–148)	0.89	111.75 ± 19.09	109.94 ± 16.48	0.32*	0.93	0.86–0.96	4.72	13.07	− 11.26 to 14.88
FACT-B + 4 (41; 0–164)	0.90	122.23 ± 23.02	120.79 ± 20.52	0.43*	0.94	0.88–0.97	5.34	14.80	− 13.37 to 16.23

Cronbach’s alpha excluding item (P2), PWB physical well-being, SWB social/ family well-being, EEWB emotional well-being, FWB functional well-being, FACT-B TOI = (PWB + FWB + BCS), FACT-B + 4 = PWB + SWB + EWB + FWB + BCS + ARM, ICC intraclass correlation coefficient, CI confidence interval, SEM standard error of the measurement, MDC minimal detectable change, FACT-B + 4 Functional Assessment of Cancer Therapy-Breast plus Arm morbidity
*Non-significant P values (P > 0.05) for Wilcoxon test

ISSN: 1472-6874