Table 1.
Baseline characteristics of patients with AS.
| Demography | N | % |
|---|---|---|
| Age at AS diagnosis (years), mean ± SD | 26.5 | 10.7 |
| Age of mSASSS score (years), mean ± SD | 41.1 | 12.7 |
| Gender, male | 423 | 76.4 |
| Clinical manifestations | ||
| Uveitis | 134 | 24.2 |
| Psoriasis | 41 | 7.4 |
| Inflammatory bowel disease | 3 | 0.5 |
| Peripheral arthritis | 102 | 18.4 |
| Enthesitis | 92 | 16.6 |
| Dactylitis | 8 | 1.4 |
| Disease activities | ||
| ESR (mm/h), mean ± SD | 12.4 | 14 |
| hsCRP (mg/dL), mean ± SD | 0.5 | 0.9 |
| ASDAS-ESR, mean ± SD | 1.7 | 0.9 |
| 0 ⩽ ASDAS-ESR < 1.3 | 184 | 33.2 |
| 1.3 ⩽ ASDAS-ESR < 2.1 | 202 | 36.5 |
| 2.1 ⩽ ASDAS-ESR ⩽ 3.5 | 147 | 26.5 |
| 3.5 < ASDAS-ESR | 21 | 3.8 |
| ASDAS-CRP, mean ± SD | 1.7 | 0.9 |
| 0 ⩽ ASDAS-CRP < 1.3 | 198 | 35.7 |
| 1.3 ⩽ ASDAS-CRP < 2.1 | 188 | 33.9 |
| 2.1 ⩽ ASDAS-CRP ⩽ 3.5 | 144 | 26 |
| 3.5 < ASDAS-CRP | 24 | 4.3 |
| BASDAI, mean ± SD | 2.5 | 1.8 |
| 0 ⩽ BASDAI < 3 | 348 | 62.8 |
| 3 ⩽ BASDAI < 4 | 88 | 15.9 |
| 4 ⩽ BASDAI < 6 | 91 | 16.4 |
| 6 ⩽ BASDAI | 27 | 4.9 |
| Comorbidities | ||
| Hypertension | 111 | 20 |
| Diabetes mellitus | 46 | 8.3 |
| Hyperlipidemia | 71 | 12.8 |
| Chronic kidney disease | 9 | 1.6 |
| Coronary artery disease | 17 | 3.1 |
| Fracture, any sites | 54 | 9.7 |
| Post total hip replacement | 18 | 3.2 |
| Post total knee replacement | 3 | 0.5 |
| Family history | ||
| AS, the first generation | 102 | 18.4 |
| AS, the second generation | 152 | 27.4 |
| Psoriasis | 21 | 3.8 |
| Psoriatic arthritis | 4 | 0.7 |
| Uveitis | 27 | 4.9 |
| Inflammatory bowel disease | 2 | 0.2 |
| Rheumatoid arthritis | 34 | 6.1 |
| Systemic lupus erythematosus | 17 | 3.1 |
| Sjogren’s syndrome | 10 | 1.8 |
AS, ankylosing spondylitis; ASDAS-CRP, The Ankylosing Spondylitis Disease Activity Score with C-reactive protein; ASDAS-ESR, The Ankylosing Spondylitis Disease Activity Score with ESR; BASDAI, Bath Ankylosing Spondylitis Disease Activity Index; ESR, erythrocyte sedimentation rate; mSASSS, modified Stoke Ankylosing Spondylitis Spinal Score; SD, standard deviation.