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

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

Patient-reported outcome measure	N	Mean (SD)	Internal consistency reliability^a
			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

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