Table 1

Characteristics of the study participants and frequency of MRI lesions recorded by ≥2 readers.

Variable

AS ≤ 5 years duration

(n = 15)

AS > 5/≤10 years duration

(n = 15)

NSBP

(n = 15)

HC

(n = 15)


Male:female

8:7

9:6

10:5

8:7

Age, years

26.4 (2.8)

31.0 (9.5)

35.0 (8.5)

28.7 (4.8)

Symptom duration, years

3.0 (2.0)

8.0 (2.0)

N/A

N/A

HLA-B27 positive, %

86.7

80.0

N/A

N/A

BASDAI, NRS

4.2 (2.2)

3.9 (2.8)

N/A

N/A

BASFI, NRS

2.9 (4.2)

1.8 (2.0)

N/A

N/A

CRP level, mg/l

8.5 (12.3)

3.8 (2.5)

N/A

N/A

ER (%)

15 (100)

15 (100)

5 (33.3)

1 (6.7)

BME (%)

15 (100)

12 (80.0)

3 (20.0)

3 (20.0)

FI (%)

14 (93.3)

12 (80.0)

4 (26.7)

4 (26.7)

EE (%)

13 (86.7)

10 (66.7)

0 (0)

0 (0)

BF (%)

8 (53.3)

11 (73.3)

0 (0)

1 (6.7)


Values for study participant characteristics are the median (IQR) unless otherwise stated. AS, ankylosing spondylitis; BASDAI, Bath Ankylosing Spondylitis Disease Activity Index; BASFI, Bath Ankylosing Spondylitis Functional Index [29]; BF, backfill; BME, bone marrow edema; CRP, C-reactive protein; EE, extended erosion; ER, erosion; FI, fat infiltration; HC, healthy controls; HLA-B27, human leucocyte antigen B27; IQR, interquartile range; N/A, not applicable; NRS, numeric rating scale; NSBP, non-specific back pain.

Weber et al. Arthritis Research & Therapy 2012 14:R124   doi:10.1186/ar3854

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