PCT MTT values for the healthy hemisphere
| Group | Sampling Interval | ||||||
|---|---|---|---|---|---|---|---|
| 0.5 second | 1 second* | 2 seconds | 3 seconds | 4 seconds | 5 seconds | 6 seconds | |
| 1 (30 mL) | |||||||
| Mean ± SD | 4.0 ± 0.4 | 4.1 ± 0.5 | 4.0 ± 0.4 | 3.8 ± 0.5 | 3.3 ± 0.4 | 3.1 ± 0.4 | 3.0 ± 0.6 |
| Range | −11.4% to +8.0% | NA | −10.0% to +9.8% | −11.1% to +4.1% | −6.2% to −33.6% | −3.1% to −40.3% | −27.0% to −53.5% |
| P value | .789 | NA | .594 | .016 | .008 | .006 | .002 |
| 2 (40 mL) | |||||||
| Mean ± SD | 4.3 ± 0.5 | 4.2 ± 0.4 | 4.1 ± 0.4 | 4.0 ± 0.5 | 3.9 ± 0.5 | 3.4 ± 0.5 | 3.1 ± 0.6 |
| Range | −6.7% to +10.1% | NA | −10.5% to +8.2% | −8.3% to +7.8% | −10.6% to +7.3% | −7.4% to −28.1% | −15.7% to −36.7% |
| P value | .202 | NA | .889 | .803 | .169 | .007 | .002 |
| 3 (50 mL) | |||||||
| Mean ± SD | 4.2 ± 0.3 | 4.1 ± 0.5 | 4.1 ± 0.6 | 4.0 ± 0.4 | 3.9 ± 0.4 | 3.8 ± 0.5 | 3.4 ± 0.4 |
| Range | −9.8% to +9.2% | NA | −9.5% to +8.6% | −9.9% to +7.0% | −10.6% to +2.8% | −11.1% to +7.0% | −9.9% to −28.3% |
| P value | 0.783 | NA | .485 | .256 | .043 | .013 | .009 |
| 4 (60 mL) | |||||||
| Mean ± SD | 4.1 ± 0.5 | 4.0 ± 0.5 | 4.2 ± 0.6 | 4.0 ± 0.5 | 4.0 ± 0.3 | 3.8 ± 0.4 | 3.7 ± 0.5 |
| Range | −9.2% to +12.4% | NA | −8.3% to +10.1% | −10.5% to +9.1% | −10.7% to +9.5% | −10.6% to +8.6% | −10.5% to +8.5% |
| P value | .487 | NA | .341 | .873 | .306 | .129 | .118 |
Note.—No significant difference (P = .556, 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.