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Modified New York criteria for ankylosing spondylitis[16]
| Low back pain for at least 3 mo duration improved by exercise and not relieved by rest |
| Limitation of lumbar spine motion in sagittal and frontal planes |
| Chest expansion decreased relative to normal values for age and sex |
| Unilateral sacroiliitis grade 3–4 |
| Bilateral sacroiliitis grade 2–4 |
| Definite ankylosing spondylitis if (4a or 4b) and any clinical criterion (1–3) |
