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TABLE 5: 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.