Table 11.

Comparison between adequate and deficient plasma vitamin C groups on SUCCAB task ratio.

SUCCAB Task (ratio)	Mean score ±SE (n = 80)		Covariates	Parameter estimates			Differences between adequate vs. deficient vitamin C level groups
All-vitamin C supplementers included	Adequate (n = 67)	Deficient (n = 13)		B	SE	p-value	Mean	SE	p-value
Simple reaction time	320.59 ± 6.98	305.81 ± 16.09	None				14.77	17.14	0.39
Choice reaction time	187.53 ± 3.90	167.23 ± 8.86	None				20.29	9.98	0.039*
Immediate recognition memory	81.47 ± 2.52	67.96 ± 5.72	None				13.77	6.26	0.031*
Congruent Stroop	133.69 ± 2.97	116.46 ± 6.81	Age	–0.486	0.177	0.008	17.24	7.48	0.024*
Incongruent Stroop	109.137 ± 2.97	109.94 ± 6.68	Age	–0.523	0.176	0.004	0.79	7.34	0.91
Spatial working memory	80.27 ± 2.95	68.02 ± 6.81	Age	–0.519	0.176	0.004	12.25	7.47	0.105
Contextual memory	75.23 ± 3.24	65.24 ± 7.36	Age	–0.350	1.910	0.07	9.98	8.10	0.22
Delayed recognition memory	71.91 ± 1.93	62.41 ± 4.35	None				9.50	4.76	0.049*
All except vitamin C supplementers	Adequate (n = 47)	Deficient (n = 13)
Simple reaction time	322.93 ± 8.56	305.82 ± 10.28	None				17.17	18.39	0.356
Choice reaction time	189.28 ± 5.077	167.24 ± 9.65	None				22.05	10.91	0.048*
Immediate recognition memory	83.96 ± 3.84	68.0 ± 5.74	None				16.26	6.48	0.015*
Congruent Stroop	137.24 ± 3.84	112.68 ± 7.22	None				24.56	8.18	0.004*
Incongruent Stroop	110.02 ± 3.80	111.57 ± 7.34	Age	–0.580	0.23	0.012	1.55	8.44	0.86
Spatial working memory	80.69 ± 3.44	70.09 ± 6.76	Age	–0.605	0.21	0.005	10.61	7.74	0.176
Contextual memory	80.45 ± 3.96	62.55 ± 7.44	None				17.91	8.43	0.038*
Delayed recognition memory	73.01 ± 3.0	62.42 ± 4.33	None				10.60	4.90	0.035*

^∗p < 0.05; SE, standard error of the mean. Bold values represent statistical significance at p < 0.05.