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The frequency with which stiffness occurred at each lumbar segment as measured with PAS
| Lumbar segment | % of Patients (n = 173) |
|---|---|
| <2 N/mm difference | 16.8 |
| L1 | 15.6 |
| L2 | 13.9 |
| L3 | 17.3 |
| L4 | 11.6 |
| L5 | 24.9 |
The lumbar segment with the highest PAS measure was ranked as stiffest when there was more than 2 N/mm difference between the patient’s most and least stiff segment.
