Table 2.
Characteristics of AS patients and comparison between trainset and testset.
| Name | Levels | Testset (N = 72) | Trainset (N = 284) | p |
|---|---|---|---|---|
| Surgery | No | 56 (77.8%) | 213 (75%) | 0.737 |
| Yes | 16 (22.2%) | 71 (25%) | ||
| BASFI | Mean ± SD | 2.7 ± 2.1 | 2.7 ± 2.1 | 0.867 |
| BASDAI | Mean ± SD | 1.9 ± 1.5 | 1.9 ± 1.4 | 0.826 |
| Gender | Female | 12 (16.7%) | 42 (14.8%) | 0.831 |
| Male | 60 (83.3%) | 242 (85.2%) | ||
| Age (year) | < 34 | 36 (50%) | 136 (47.9%) | 0.851 |
| ≥34 | 36 (50%) | 148 (52.1%) | ||
| BMI (kg/m2) | Mean ± SD | 21.7 ± 2.8 | 22.1 ± 3.0 | 0.301 |
| Occupation | Manual | 17 (23.6%) | 71 (25%) | 0.927 |
| Non-manual | 55 (76.4%) | 213 (75%) | ||
| Smoking | No | 46 (63.9%) | 175 (61.6%) | 0.827 |
| Yes | 26 (36.1%) | 109 (38.4%) | ||
| Drinking | No | 58 (80.6%) | 214 (75.4%) | 0.439 |
| Yes | 14 (19.4%) | 70 (24.6%) | ||
| Exercise | No | 64 (88.9%) | 247 (87%) | 0.811 |
| Yes | 8 (11.1%) | 37 (13%) | ||
| Onset (year) | < 20 | 12 (16.7%) | 87 (30.6%) | 0.027 |
| ≥20 | 60 (83.3%) | 197 (69.4%) | ||
| Delay (year) | < 7 | 57 (79.2%) | 212 (74.6%) | 0.520 |
| ≥7 | 15 (20.8%) | 72 (25.4%) | ||
| Duration (year) | < 10 | 53 (73.6%) | 183 (64.4%) | 0.183 |
| ≥10 | 19 (26.4%) | 101 (35.6%) | ||
| Family history | No | 62 (86.1%) | 245 (86.3%) | 1.000 |
| Yes | 10 (13.9%) | 39 (13.7%) | ||
| Night pain | No | 37 (51.4%) | 135 (47.5%) | 0.651 |
| Yes | 35 (48.6%) | 149 (52.5%) | ||
| PGA | >3 | 18 (25%) | 79 (27.8%) | 0.740 |
| ≤ 3 | 54 (75%) | 205 (72.2%) | ||
| Lumbar mobility | Limited | 60 (83.3%) | 245 (86.3%) | 0.655 |
| Normal | 12 (16.7%) | 39 (13.7%) | ||
| Cervical mobility | Limited | 14 (19.4%) | 39 (13.7%) | 0.303 |
| Normal | 58 (80.6%) | 245 (86.3%) | ||
| Fatigue | No | 15 (20.8%) | 52 (18.3%) | 0.749 |
| Yes | 57 (79.2%) | 232 (81.7%) | ||
| Spinal pain | Multiple locations | 15 (20.8%) | 57 (20.1%) | 1.000 |
| Single location | 57 (79.2%) | 227 (79.9%) | ||
| Hip involvement | No | 29 (40.3%) | 143 (50.4%) | 0.163 |
| Yes | 43 (59.7%) | 141 (49.6%) | ||
| Peripheral arthritis | No | 66 (91.7%) | 250 (88%) | 0.507 |
| Yes | 6 (8.3%) | 34 (12%) | ||
| Morning stiffness | No | 15 (20.8%) | 73 (25.7%) | 0.482 |
| Yes | 57 (79.2%) | 211 (74.3%) | ||
| ESR | < 20 | 23 (31.9%) | 112 (39.4%) | 0.301 |
| ≥20 | 49 (68.1%) | 172 (60.6%) | ||
| CRP | < 10 | 32 (44.4%) | 115 (40.5%) | 0.635 |
| ≥10 | 40 (55.6%) | 169 (59.5%) | ||
| WBC | Mean ± SD | 8.1 ± 1.9 | 8.4 ± 2.0 | 0.293 |
| RBC | Mean ± SD | 4.9 ± 0.7 | 5.0 ± 0.6 | 0.580 |
| Anemia | No | 46 (63.9%) | 180 (63.4%) | 1.000 |
| Yes | 26 (36.1%) | 104 (36.6%) | ||
| SJ | Fused | 30 (41.7%) | 103 (36.3%) | 0.478 |
| Unfused | 42 (58.3%) | 181 (63.7%) | ||
| BH | Mean ± SD | 2.3 ± 1.3 | 2.2 ± 1.3 | 0.555 |
BASFI, Bath Ankylosing Spondylitis Functional Index; BASDAI, Bath Ankylosing Spondylitis Disease Activity Index; BMI, body mass index; PGA, Patient Global Assessment of Disease Activity; ESR, erythrocyte sedimentation rate; CRP, C-reactive protein; SJ, sacroiliac joint; BH, Bath Ankylosing Spondylitis Radiology Index-Hip.