TABLE 4.

MANCOVA: associated univariate F tests for gender by group interaction for HVLT-R and SDMT task performance¹

Model	Task	F-test interaction P value	R 2	Covariate	β ± SE	Covariate P value
Gender by adequate/inadequate plasma group interaction term	Trial 1	<0.001	0.95	—	—	—
	Trial 2	<0.001	0.97	Vit C dose	0.001 ± 0.001	0.03
	Trial 3	<0.001	0.98	Vit C dose	0.001 ± 0.001	0.006
	Total recall	<0.001	0.98	Vit C dose	0.002 ± 0.001	0.02
	Delayed recall	<0.001	0.97	Age	−0.04 ± 0.013	0.003
				Vit C dose	0.001 ± 0.001	0.01
	Recognition index	<0.001	0.99	Age	−0.019 ± 0.009	0.04
	SDMT	<0.001	0.97	Age	−0.36 ± 0.06	<0.001

¹HVLT-R, Hopkins Verbal Learning Test–Revised; MANCOVA, multivariate ANCOVA; SDMT, Symbol Digits Modalities Test; Vit, vitamin; β, β-slope coefficient related to the covariates accounted for in the MANCOVA.