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Table 1 Characteristics of the study participants and frequency of MRI lesions recorded by ≥2 readers.

From: Can erosions on MRI of the sacroiliac joints be reliably detected in patients with ankylosing spondylitis? - A cross-sectional study

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)
  1. 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.