Age at baseline, years
|
33.7 (11.7)
|
Male sex
|
276 (46%)
|
Duration of back pain, yearsa
|
7.1 (9.0)
|
Self-reported ethnicity
|
White
|
348 (59%)
|
Asian
|
214 (36%)
|
Otherb
|
32 (5%)
|
IBP (according to experts’ definition)
|
301/532 (57%)
|
Good response to NSAIDsc
|
274 (46%)
|
Peripheral arthritisd
|
197 (33%)
|
Enthesitisd
|
241 (41%)
|
AAUd
|
53 (9%)
|
Dactylitisd
|
23 (4%)
|
Psoriasisd
|
22 (4%)
|
IBDd
|
8 (1%)
|
Positive family history according to ASAS definition
|
135 (23%)
|
Positive family history of AS
|
87 (15%)
|
Positive family history of AAU
|
7 (1%)
|
Positive family history of ReA
|
8 (1%)
|
Positive family history of IBD
|
12 (2%)
|
Positive family history of Psoriasis
|
36 (6%)
|
Total number of SpA-related diseases in first- or second-degree relatives
|
Number of patients with one disease
|
120 (20%)
|
Number of patients with two diseases
|
15 (3%)
|
Total number of family members with SpA-related diseases
|
Number of patients with one relative
|
102 (17%)
|
Number of patients with two relatives
|
30 (5%)
|
Number of patients with three relatives
|
3 (1%)
|
Total number of patients with positive family history in
|
First-degree relatives only
|
100 (17%)
|
Second-degree relatives only
|
25 (4%)
|
Both first- and second-degree relatives
|
10 (2%)
|
HLA-B27 positivity
|
310 (52%)
|
Elevated CRP/ESR
|
185 (31%)
|
Definite radiographic sacroiliitise
|
119/593 (20%)
|
Presence of active inflammation on MRI-SI
|
189/424 (45%)
|
Number of SpA featuresf,g
|
2.4 (1.6)
|
Clinical diagnosis of axSpAh
|
368 (62%)
|