Comparison of NIHSS scores at the different time points after thrombolysis with before thrombolysis in the UTO and control groups (one-tailed t-test results, p values)
| Group | Intravenous tPA at 2 hours | Intravenous tPA at 24 hours | Intravenous tPA at 7 days | Before discharge |
| UTO (n=42) | <0.001 | 0.018 | 0.002 | <0.001 |
| Control (n=62) | 0.105 | 0.017 | <0.001 | <0.001 |
NIHSS, National Institutes of Health Stroke Scale; tPA, tissue plasminogen activator; UTO, unknown time of onset.