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Patient demographics.
| Group A (n=35) | Group B (n=30) | Group C (n=127) | Group D (n=115) | |
|---|---|---|---|---|
| Age, mean (SD), year | 61.66(13.07) | 62.93(12.26) | 48.69(13.07) | 46.3(13.98) |
| Female sex, No.(%) | 16(45.7) | 14(46.7) | 53(41.7) | 52(45.2) |
| Levels | ||||
| L3-4 | 3 | 0 | 4 | 2 |
| L4-5 | 26 | 27 | 75 | 58 |
| L5-S1 | 6 | 3 | 48 | 55 |
