Table 2.

Final study-immediate recall, encoding scores, and weighted recall scores for PD patients separated by SLC6A3 genotype.

		Encoding		Weighted recall
	n	OFF	ON	OFF	ON
10R/10R	30	4.83 (0.45)	5.07 (0.43)	0.99 (0.05)	1.27 (0.75)
9R	14	5.86 (0.75)	4.43 (0.55)	1.03 (0.09)	1.22 (0.15)

All values reported are group means (SEM). First trial values correspond to the mean number of items recalled by each group in the first study-immediate recall trial. Final recall values correspond to the mean number of items recalled by each group in the final study-immediate recall trial. Encoding scores were calculated for each participant by subtracting the first recall score from the final recall score. Weighted recall scores were calculated by dividing the number of items recalled after a 30-min delay by the number of items recalled during the final study-immediate recall trial. 10R/10R groups are composed of PD patients who were homozygous for the 10R SLC6A3 40-bp VNTR allele. 9R groups are composed of PD patients who were heterozygous for the 9R SLC6A3 40-bp VNTR allele.