Time intervals from Walton Centre data in minutes
| Mean | Minimum | Maximum | |
|---|---|---|---|
| Onset to arrival at first hospital | 85.04 | 0 | 420 |
| Arrival at first hospital to first brain imaging | 32.06 | 8 | 120 |
| Arrival at first hospital to procedure start | 218 | 108 | 552 |
| Arrival at Walton Centre to procedure start | 24.03 | 5 | 74 |
| Onset to procedure start | 306.39 | 125 | 980 |
| Duration of procedure | 51.23 | 16 | 125 |
For onset to arrival at first hospital the second longest patient was 232 minutes, the average after accounting for this was mean = 75.93. For arrival at Walton Centre to procedure start, 18 were not known and five did not have the procedure performed.