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Table 5 Relationship between clinical severity and selected 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

Clinical Severity Measure Patient-reported outcome measure
  FACIT-Fatigue Mean (SE) PCS
Mean (SE)
MCS
Mean (SE)
BASDAI, 0-10 VAS    
   ≥7 17.55 (1.64) 29.25 (0.57) 40.23 (1.01)
   4 to 6.9 26.08 (1.26) 33.22 (0.50) 45.19 (0.69)
   <4 37.86 (2.32) 40.77 (1.25) 45.29 (1.88)
   p-value < 0.0001 < 0.0001 = 0.0003
BASDAI fatigue, 0-10 VAS    
   ≥7 18.50 (1.30) 30.27 (0.49) 40.20 (0.78)
   4 to 6.9 27.24 (1.58) 34.09 (0.65) 45.95 (0.84)
   < 4 36.18 (1.24) 37.95 (1.24) 48.94 (1.70)
   p-value < 0.0001 < 0.0001 < 0.0001
BASDAI pain, 0-10 VAS    
   ≥7 20.47 (1.39) 30.20 (0.45) 42.56 (0.76)
   4 to 6.9 29.14 (1.64) 35.71 (0.68) 45.41 (0.88)
   < 4 29.25 (4.50) 39.66 (1.65) 41.23 (2.20)
   p-value = 0.0002 < 0.0001 = 0.298
Total back pain, 0-100 VAS    
   ≥66 21.60 (1.46) 30.00 (0.47) 42.71 (0.78)
   34 to 65 27.99 (1.65) 35.29 (0.65) 43.78 (0.91)
   < 34 24.00 (8.00) 38.98 (1.33) 46.60 (1.90)
   p-value = 0.013 < 0.0001 = 0.076
BASFI, 0-100 VAS    
   ≥66 17.63 (1.60) 26.83 (0.47) 41.57 (1.10)
   34 to 65 24.88 (1.45) 33.45 (0.48) 44.06 (0.79)
   < 34 33.62 (2.19) 39.51 (1.78) 44.77 (1.14)
   p-value < 0.0001 < 0.0001 = 0.028