Measurement properties of the Short Form-36 (SF-36) and the Functional Assessment of Cancer Therapy - Anemia (FACT-An) in patients with anemia associated with chronic kidney disease

Table 3 Internal Consistency and Test-retest Reliability of the SF-36 and the FACT-An Subscales

SF-36 domain/Component Summary score	N^a	Cronbach’s alpha	N^b	Test-retest (ICC)	FACT-An total/subscale	N^a	Cronbach’s alpha	N^b	Test-retest (ICC)
Physical functioning	188	0.90	77	0.83	Anemia subscale	190	0.92	76	0.83
Role-physical	193	0.93	76	0.69	Fatigue subscale	196	0.93	76	0.80
Vitality	193	0.82	75	0.64	Total FACT-An score	131	0.95	76	0.88
Role-Emotional	193	0.93	77	0.74	FACT-G score	133	0.91	76	0.86
Mental Health	193	0.81	77	0.75	Functional Well-Being	196	0.87	76	0.83
Social Functioning	194	0.76	77	0.69	Physical Well-Being subscale	196	0.84	76	0.83
Bodily Pain	194	0.88	77	0.74	Social Well-Being	137	0.80	76	0.76
General Health	192	0.69	77	0.75	Emotional Well-Being	193	0.79	76	0.72
Physical Component Summary score	–	0.92	76	0.81
Mental Component Summary score	–	0.90	76	0.75

Abbreviations: ICC intraclass correlation coefficient, FACT-An Functional Assessment of Cancer Therapy-Anemia, FACT-G Functional Assessment of Cancer Therapy-General, SF-36 Medical Outcomes Survey Short Form-36
^a.Number of subjects at Baseline
^b.Number of subjects with average weekly Hb change within +/− 0.5 g/dL between Week 9 and Week 13/17 (study FGCL-4592-053/study FGCL-4592-041) and who have not received rescue therapy