TABLE 3

Matrix of Group Results

PET	Young	Old	P value
Wild-type	65.0 ± 16.9	82.6 ± 20.9	0.185 (NS)
Transgenic	73.8 ± 15.0	129.3 ± 15.3	<0.001 (S)
P value	0.413 (NS)	0.004 (S)

MRI	Young*^†	Old*^†	P value*^†
Wild-type	94.7 ± 14.6	106.2 ± 12.3	0.214 (NS)
	111.3 ± 16.0^†	122.8 ± 12.3^†	0.27^† (NS)
Transgenic	114.7 ± 15.2	160.5 ± 25.7	0.012 (S)
	132.3 ± 15.8^†	174.6 ± 25.5^†	0.014^† (S)
P value	0.067 (NS)	0.006 (S)
	0.071^† (NS)	0.004^† (S)

↵* First row of results for equal fractional contributions of end-diastolic or end-systolic volumes in definition of LV-VI_MRI (x_ED = x_ES = 0.5).
↵^† Denotes values with unequal fractional contributions (x_ED = 0.8, x_ES = 0.2).
NS = nonsignificant results; S = significant results.
Mean values of midmyocardial volumes (in μL) ± SDs for all 4 groups of animals (young—old, wild-type—transgenic) are presented together with t-test results (P values). Results are presented separately for PET and MRI measurement techniques.