| L3/4 (n = 50) | L5/S1 (n = 50) |
A | 14 | 11 |
B | 12 | 11 |
C | 13 | 16 |
D | 11 | 9 |
E | 0 | 3 |
| r = 0.444, P < 0.01 | r = 0.090, P > 0.05 |