Table 3.
Multiple regression analysis of injected amount and viscosity for possibility of reaching the specific landmarks (n=118).
| Possibility of reaching at the landmarks | Unstandardized coefficient (p value) | Adjusted R square | |
|---|---|---|---|
| Viscosity† | Amount (mL) | ||
| Reaching at PED | −16.5 (0.051) | 93.6 (<0.001) | 0.796 |
| Reaching at SIVD | −18.7 (<0.001) | 38.9 (<0.001) | 0.813 |
| Reaching at IIVD | −14.1 (<0.001) | 31.1 (<0.001) | 0.873 |
| Reaching at BIVD | −13.5 (<0.001) | 33.4 (<0.001) | 0.937 |
| Reaching at MID | −1.5 (0.105) | 14.5 (<0.001) | 0.955 |
PED: the medial aspect of the superior pedicle of the corresponding level of injection; SIVD: the superior aspect of the superior intervertebral disc of the corresponding level of injection; IIVD: the inferior aspect of the inferior intervertebral disc of the corresponding level of injection; MID: beyond the midline, spinous process, of the contralateral spinal segment. †The viscosity variable is a binary value: raw (100%) and low (50% dilution) variables.