Table 3.
Biophysical parameters
| Per vein | Overall (n = 575) | No ERC (n = 522) | ERC (n = 53) | P value |
|---|---|---|---|---|
| Temperature at 30 seconds (°C) | -31 ± 6 | -31 ± 5 | -29 ± 8 | .058 |
| Temperature at 60 seconds (°C) | -38 ± 6 | -39 ± 6 | -35 ± 8 | .004 |
| Nadir balloon temperature (°C) | -47 ± 7 | -47 ± 7 | -42 ± 9 | <.001 |
| Temperature at time to isolation (°C) | -34 ± 8 | -34 ± 8 | -34 ± 8 | .789 |
| Freeze (AUC) | 7928 ± 1797 | 7999 ± 7285 | 7285 ± 1961 | .007 |
| Freeze magnitude (freeze AUC/total application time) | 38 ± 5 | 38 ± 5 | 35 ± 7 | <.001 |
| Warming time to 0°C (s) | 9 ± 6 | 9 ± 6 | 6 ± 4 | .001 |
| Warming time to 15°C (s) | 34 ± 16 | 35 ± 16 | 25 ± 16 | <.001 |
| Warming time to 20°C (s) | 41 ± 18 | 42 ± 18 | 31 ± 18 | <.001 |
AUC = area under the curve (sum of temperature × time).