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Table 1 Demographics and clinical characteristics in study participants (n = 579)

From: Work outcome in yet undiagnosed patients with non-radiographic axial spondyloarthritis and ankylosing spondylitis; results of a cross-sectional study among patients with chronic low back pain

 

CLBP (n = 484)

Nr-axSpA (n = 71)

AS (n = 24)

Age, mean (SD) yearsa

35.6 (7.1)

36.8 (6.6)

38.6 (5.8)

Male sex, n (%)

202 (42)

30 (42)

6 (25)

LBP duration, mean (SD) years

9.2 (7.7)

9.6 (7.4)

9.3 (9.9)

Disease activity

 VAS pain, median (IQR)b

5 (3–7)

4 (2–5)

4.5 (2–7)

 BASDAI, median (IQR)

4.2 (2.3–6)

3.9 (2.4–5.4)

5.3 (2.9–6.6)

 ASDAS-CRP, median (IQR)c

2.3 (1.6–2.9)

2.3 (1.6–2.9)

2.8 (2.1–3.5)

 RMDQ, median (IQR)d

7 (3–13)

6 (3–9)

12 (5–17)

Educational levele

 Low (elementary school) (%)

177 (38)

29 (41)

11 (46)

 Medium (high school) (%)

194 (41)

24 (34)

11 (46)

 High (university) (%)

101 (21)

17 (24)

2 (8)

Work status

 Employed, n (%)

342 (72.2)

55 (77.5)

15 (62.5)

 Disability pension, n (%)

8 (1.7)

2 (2.8)

0 (0)

 Number of hours working per week, mean (SD)f

33.1 (9.4)

34.6 (8.6)

27.9 (12.4)

Occupation in employed patientsf

 Manual, n (%)

124 (37)

24 (46)

4 (29)

 Non-manual, n (%)

208 (63)

28 (54)

10 (71)

  1. CLBP chronic low back pain, Nr-axSpA non-radiographic axial spondyloarthritis, AS ankylosing spondylitis, IQR interquartile range, LBP low back pain, VAS visual analog scale, BASDAI Bath Ankylosing Spondylitis Disease Activity Index, ASDAS-CRP Ankylosing Spondylitis Disease Activity Score-C-reactive protein, RMDQ Rolland Morris Disability Questionnaire. a p = 0.04 for CLBP vs. AS; b p = 0.04 for CLBP vs. nr-axSpA; c p = 0.01 for CLBP vs. AS; d p = 0.03 for CLBP vs. AS; etotal number of questionnaires about educational level: CLBP, n = 472 (12 missing), nr-axSpA, n = 70 (1 missing); ftotal number of questionnaires about occupation and working hours in employed patients: CLBP, n = 332 (10 missing), AS, n = 14 (1 missing), nr-axSpA, n = 52 (3 missing)