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Table 1. Descriptive characteristics of the patients according to the rheumatologist’s clinical SpA diagnosis.
Characteristic
Male gender, N (%) Age, (years)
Age at first symptom (years)
Symptom duration (years)
Chronic back pain, * N (%)
IBP, *N(%)
Buttock pain, * N (%)
Asymmetric oligoarthritis, * N (%)
Enthesitis, * N (%)
Dactyilitis, * N (%)
Pos family history, N (%)
Uveitis, * N (%)
Psoriasis, * N (%)
IBD, * N (%)
Preceding infection, N (%)
HLA-B27 positive, N (%)
CRP (mg/dl)
ESR (mm/hr) Sacroiliitis X-ray, N (%) Sacroiliitis MRI, N (%)
Total
n=581
417 (71.7) 35±13.5 28±10.6 7.3±9.7
439 (75.6) 258 (44.4) 172 (29.6) 419 (72.1) 332 (57.1) 84 (14.4) 31 (5.3) 35 (6)
27 (4.6) 0 (0) 210 (36.1)
194 (43.9) n=441 11.7±34.8 n=178
25.1±17.7 n=302 158 (45.8) n=345 69 (50.3) n=137
AS
n=169
(29.1) (39.6) (26.9) (3.6) (0.9)
uSpA
ReA
PsA
IBD
n=230
n=156
n=21
n=5
117 (69.2) 39.2±14.2 28.9±11.3 10.4±11.1
169 (100)
111 (66.7)
71 (42)
106 (62.7)
118 (69.8)
30 (17.8)
13 (7.7)
16 (9.5)
5 (2.9)
0 (0)
32 (18.9)
84 (62.7) n=134 5.9±12.2 n=39
21±13.4 n=57 154 (98.7) n=156 34 (77.3) n=44
161 (70) 34.8±12.7 28.4±10.1 6.6±8.9
195 (84.8)
111 (48.3)
68 (29.6)
143 (62.2)
138 (60)
23 (10)
8 (3.5)
13 (5.7)
2 (0.8)
0 (0)
32 (13.9)
56 (31.3) n=179 8.7±31.7 n=82
20.6±15.7 n=125
0 (0) n=117 33 (47.1) n=70
126 (80.1) 27.4±9.7 24.5±8.2 3.4±6.7
58 (37.2) 29 (18.6) 27 (17.3) 148 (94.9) 65 (41.7) 25 (16)
9 (5.8)
5 (3.2)
0 (0)
0 (0)
144 (92.3)
52 (46.4) n=112 21.7±49.1 n=51
32.3±19.6 n=112
0 (0) n=60
0 (0) n=20
12 (57.1) 48.3±10.7 35.8±14.9 12.5±12.7
13 (61.9)
5 (23.8)
4 (19)
18 (85.7)
10 (47.6)
4 (19)
1 (4.8)
0 (0)
20 (95.2)
0 (0)
2 (9.5)
1 (8.3) n=12 5.6±4.9 n=4
22.6±15.3 n=6
2 (22.2) n=9
1 (50) n=2
1 (20) 49.1±15.7 43.1±18.6 6.0±8.0
4 (80) 2 (40) 2 (40) 4 (80) 1 (20) 2 (40) 0 (0) 1 (20) 0 (0) 5 (100) 0 (0)
1 (25) n=4 5.1±6.8 n=2
36±0 n=2
2 (66.7) n=3
1 (100) n=1
Values are given as the means (SD) for the continuous variables and as a percentage for the categorical variables, unless otherwise specified.
* refers to a history (past) or the presence (current) of these features at the time of assessment
AS, ankylosing spondylitis; uSpA, undifferentiated spondyloarthritis; ReA, reactive arthritis; PsA, psoriatic arthritis; IBD, SpA associated with inflammatory bowel disease; CRP, C-reactive protein; ESR, erythrocyte sedimentation rate; MRI, magnetic resonance imaging; IBP, inflammatory back pain; ASDAS, Ankylosing Spondylitis Disease Activity Score.
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