Clinical features of juvenile-onset ankylosing spondylitis (JoAS) and adult-onset ankylosing spondylitis (AoAS) cohorts
| AoAS (%) | JoAS (%) | OR (95% CI) adjusted for disease duration | OR (95% CI) adjusted for current age | |
| Arthritis pattern at diagnosis | ||||
| Axial ± peripheral | 95.0 | 74.0 | 6.93 (2.80 to 17.20) | 4.64 (1.60 to 13.45) |
| Peripheral only | 5.0 | 26.0 | ||
| History of | ||||
| Neck pain | 58.2 | 32.4 | 2.93 (1.54 to 5.55) | 1.38 (0.66 to 2.88) |
| Neck stiffness | 67.2 | 38.2 | 3.39 (1.80 to 6.39) | 1.40 (0.67 to 2.93) |
| Back pain | 87.3 | 69.1 | 2.96 (1.43 to 6.11) | 2.76 (1.08 to 7.05) |
| Back stiffness | 90.3 | 73.5 | 3.30 (1.50 to 7.28) | 2.51 (0.91 to 6.94) |
| Morning stiffness | 88.8 | 72.1 | 2.88 (1.35 to 6.16) | 1.66 (0.67 to 4.28) |
| Location of pain | ||||
| Sacroiliac | 60.3 | 33.8 | 2.24 (1.21 to 4.14) | 2.61 (1.26 to 5.44) |
| Sacrum | 50.4 | 38.8 | 1.63 (0.89 to 2.98) | 1.40 (0.69 to 2.85) |
| Buttocks | 60.6 | 38.2 | 2.43 (1.33 to 4.47) | 2.75 (1.33 to 5.68) |
| Lumbar spine | 83.3 | 61.2 | 3.03 (1.53 to 5.99) | 2.02 (0.88 to 4.62) |
| Thoracic spine | 39.8 | 23.5 | 1.97 (1.00 to 3.86) | 1.21 (0.55 to 2.66) |
Data shown as odds ratio (OR) with 95% confidence intervals (95% CI) adjusted for disease duration and for current age.
Figures shown in bold represent significant differences between the groups.