Table 3.
Comparative risk of hematoma in subgroups
| Variables | N | Definite or possible hematoma |
Chi square | P value |
|---|---|---|---|---|
|
| ||||
| Recent EMG | 29 | 6 | 0.085 | 0.770 |
| No recent EMG | 25 | 6 | ||
|
| ||||
| Clinical Spinal stenosis | 24 | 5 | 0.048 | 0.826 |
| No clinical spinal stenosis | 30 | 7 | ||
|
| ||||
| Taking aspirin | 16 | 3 | 0.159 | 0.690 |
| Not taking aspirin | 38 | 9 | ||
|
| ||||
| Recent EMG and aspirin | 8 | 1 | 0.452 | 0.502 |
| Recent EMG and no aspirin | 21 | 5 | ||
|
| ||||
| Taking other NSAID | 24 | 6 | 0.193 | 0.661 |
| Not taking other NSAID | 30 | 6 | ||
|
| ||||
| Recent EMG and other NSAID | 10 | 3 | 0.806 | 0.309 |
| Recent EMG and no other NSAID | 19 | 3 | ||