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Table 2 Baseline descriptive statistics and internal consistency reliability coefficients for patient-reported outcomes

From: Psychometric characteristics of the short form 36 health survey and functional assessment of chronic illness Therapy-Fatigue subscale for patients with ankylosing spondylitis

Patient-reported outcome measure N Mean (SD) Internal consistency reliabilitya
    Baseline Week 12
FACIT-Fatigue 82 24.0 (10.2) 0.82 0.86
SF-36     
   Physical function 396 47.8 (22.0) 0.87 0.92
   Role-physical 397 19.3 (29.3) 0.76 0.84
   Bodily pain 397 31.0 (15.8) 0.77 0.89
   General health 396 42.2 (20.0) 0.74 0.78
   Vitality 397 33.0 (17.6) 0.78 0.88
   Social function 397 54.9 (24.2) 0.80 0.84
   Role-emotional 395 52.2 (42.6) 0.82 0.83
   Mental health 397 62.2 (18.7) 0.83 0.87
  1. a Cronbach alpha.