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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