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Table 3 Characteristics of HLA-B27 positive patients with RA who met any of the classification criteria for SpA or AS

From: Frequency of inflammatory back pain and sacroiliitis in Egyptian patients with rheumatoid arthritis

Parameter

Mean ± SD (range) or n (%)

RA patients

(n = 21)

Age (years)

37.09 ± 11.78 (21–62)

Sex F:M

15/6 2.5:1

RF +ve

10 (47.61)

X-ray hand/wrist erosions

14 (66.7)

IBP

20 (95.2)

Clinical enthesitis

19 (90.5)

Clinical SI

13 (62.9)

Radiographic SI

18 (85.7)

X-ray lumbar changes*

19 (90.5)

  1. RA rheumatoid arthritis, RF rheumatoid factor, IBP inflammatory back pain, SI sacroiliitis
  2. *Squaring and Roman’s sign