PCT MTT values for the ischemic area
| Group | Sampling Interval | ||||||
|---|---|---|---|---|---|---|---|
| 0.5 second | 1 second* | 2 seconds | 3 seconds | 4 seconds | 5 seconds | 6 seconds | |
| 1 (30 mL) | |||||||
| Mean ± SD | 5.8 ± 0.6 | 5.9 ± 0.7 | 5.6 ± 0.7 | 5.4 ± 0.6 | 4.1 ± 0.6 | 3.2 ± 0.6 | 3.1 ± 0.6 |
| Range | −16.0% to +10.5% | NA | −17.6% to +7.8% | −13.3% to +16.3% | −13.6% to −44.3% | −32.1% to −67.5% | −42.4% to −75.2% |
| P value | .634 | NA | .168 | .099 | .009 | .002 | .002 |
| 2 (40 mL) | |||||||
| Mean ± SD | 6.0 ± 0.7 | 5.8 ± 0.8 | 5.6 ± 0.7 | 5.4 ± 0.6 | 4.1 ± 0.5 | 3.5 ± 0.5 | 3.4 ± 0.5 |
| Range | −9.2% to +18.1% | NA | −18.7% to +9.3% | −17.6% to +7.3% | −9.8% to −36.2% | −26.3% to −60.5% | −37.9% to −50.5% |
| P value | .205 | NA | .623 | .277 | .004 | .002 | 0.002 |
| 3 (50 mL) | |||||||
| Mean ± SD | 5.8 ± 0.6 | 5.9 ± 0.9 | 6.0 ± 0.6 | 5.7 ± 0.7 | 5.3 ± 0.7 | 4.3 ± 0.6 | 4.3 ± 0.6 |
| Range | −17.1% to +16.5% | NA | −11.8% to +19.7% | −18.2% to +15.5% | −22.5% to +8.9% | −12.1% to −43.2% | −28.1% to −36.0% |
| P value | .611 | NA | .652 | .435 | .057 | .007 | .006 |
| 4 (60 mL) | |||||||
| Mean ± SD | 6.1 ± 0.8 | 6.1 ± 0.8 | 5.9 ± 0.6 | 6.0 ± 0.7 | 5.6 ± 0.7 | 5.5 ± 0.6 | 4.8 ± 0.6 |
| Range | −19.6% to +11.6% | NA | −19.5% to +12.3% | −18.4% to +12.4% | −17.7% to +9.5% | −16.1% to +10.35% | −13.0% to −33.1% |
| P value | .677 | NA | .528 | .649 | .283 | .017 | .008 |
Note.—No significant difference (P = .108, Kruskal-Wallis) was identified among the four groups for MTT values obtained with an interval of 1 second. Range indicates the overestimation or underestimation compared with the reference. Values in boldface indicate the temporal sampling interval thresholds beyond which MTT values were significantly underestimated.
* Reference for Wilcoxon (Mann-Whitney) tests performed in each group. NA indicates not applicable.