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Table 2 Reliability of the physical functioning, bodily pain, and general health perceptions scales when the entire SF-36 was administered on two occasions (T1 & T2)

From: Performance of health-status scales when used selectively or within multi-scale questionnaire

Scale (n = 62) Alphaa   Mean (SD)  
  T1 T2 ICC (95% CI)b T1 T2 Mean difference (95% CI)
Physical functioning 0.88 0.88 0.92 (0.86–0.95) 67.3 (23) 67.4 (23) 0.1 (-2.4–2.6)
Bodily pain 0.86 0.89 0.86 (0.78–0.92) 44.7 (21) 46.7 (23) 1.9 (-1.0–4.9)
General health perceptions 0.79 0.72 0.83 (0.73–0.89) 61.0 (20) 62.0 (17) 1.0 (-1.8–3.8)
  1. a Cronbach alpha coefficient values range from 0 (no) to 1 (perfect) reliability. b Intraclass correlation coefficient (ICC) values range from 0 (no) to 1 (perfect) reliability. CI, confidence interval