Relationship between tobacco consumption and spinal stiffness levels in patients with ax-SpA
| Smoker | Occasional smoker | Non smoker | P | χ2 | |
|---|---|---|---|---|---|
| Cervical stiffness | 84.2% | 77.1% | 73.1% | 0.171 | 9.044 |
| Dorsal stiffness | 76.0% | 76.6% | 72.4% | 0.408 | 6.141 |
| Lumbar stiffness | 89.0% | 93.8% | 83.5% | 0.002 | 20.518 |
Source: Spanish Atlas.