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

From: 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

SF-36 domain/Component Summary score Na Cronbach’s alpha Nb Test-retest (ICC) FACT-An total/subscale Na Cronbach’s alpha Nb 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      
  1. 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
  2. a.Number of subjects at Baseline
  3. 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