Distribution of DRGs
| Intraspinal* | Foraminal | Extraforaminal | Total | |
|---|---|---|---|---|
| L1 | ||||
| Female | 0 (0) | 121 (99.2) | 1 (0.8) | 122 |
| Male | 0 (0) | 108 (100) | 0 (0) | 108 |
| Combined | 0 (0) | 229 (99.6) | 1 (0.4) | 230 |
| L2 | ||||
| Female | 0 (0) | 121 (99.2) | 1 (0.8) | 122 |
| Male | 0 (0) | 107 (99.1) | 1 (0.9) | 108 |
| Combined | 0 (0) | 228 (99.1) | 2 (0.9) | 230 |
| L3 | ||||
| Female | 0 (0) | 120 (98.4) | 2 (1.6) | 122 |
| Male | 0 (0) | 105 (97.2) | 3 (2.8) | 108 |
| Combined | 0 (0) | 225 (97.8) | 5 (2.2) | 230 |
| L4 | ||||
| Female | 0 (0) | 122 (100) | 0 (0) | 122 |
| Male | 0 (0) | 108 (100) | 0 (0) | 108 |
| Combined | 0 (0) | 230 (100) | 0 (0) | 230 |
| L5 | ||||
| Female | 9 (7.4)† | 113 (92.6) | 0 (0) | 122 |
| Male | 4 (3.7)† | 104 (96.3) | 0 (0) | 108 |
| Combined | 13 (5.7) | 217 (94.3) | 0 | 230 |
| Total | 13 | 1129 | 8 | 1150 |
Note:—Data in parentheses are percentages calculated on the basis of the total of each sex. DRG indicates dorsal root ganglion.
* There was statistically significant difference in the distribution of DRG position among the different levels (χ2 = 53.687, P < .0001).
† At level L5, there was no statistical difference in the incidence of intraspinal ganglia of DRG between women and men (Fisher exact test, P = .265).