Multiple median regression model (follow-up volume)
| Follow-Up Volume | Median Absolute Growth (mL) | P Value | 95% CI |
|---|---|---|---|
| Swirl sign | 5.77 | .001 | 2.37 to 9.18 |
| Initial hematoma volume (mL) | 1.01 | .000 | 0.95 to 1.06 |
| Time between CT1 and CT2 (hr) | −0.07 | .028 | −0.12 to −0.007 |
| Time between onset and CT1 (hr) | −0.0003 | .251 | −0.0008 to 0.0002 |