. Author manuscript; available in PMC: 2018 Mar 1.

Published in final edited form as: Brain Struct Funct. 2017 Sep 18;223(2):727–737. doi: 10.1007/s00429-017-1519-7

Table 1. Sample Characteristics according to Age Group and Study;

WTAR = Wechsler Test of Adult Reading test ; ms: milliseconds; p-values refer to group differences comparing subjects of younger and older age within the respective study; mean RR: mean inter-beat-interval between adjacent heart beats in ms; RMSSD: root mean square successive differences in ms

	Study 1			Study 2

	older age	younger age	p	older age	younger age	p

N (female)	19 (9)	19 (7)		23 (11)	27 (10)
Age, mean years (SD)	68.11 (5.10)	25.05 (5.28)	<.001	67.17 (5.49)	23.63 (4.79)	<.001
Education	16.17 (2.33)	15.21 (2.27)	.22	16.00 (2.28)	16.30 (3.16)	.71
WTAR	43.63 (6.44)	43.16 (3.70)	.78	40.68 (7.13)	43.96 (5.69)	.11
RR, mean ms (SD)	942.77 (164.20)	834.56(88.26)	.02	844.74 (212.08)	862.21 (102.15)	.71
RMSSD, mean ms (SD)	18.43 (7.34)	25.81 (8.85)	<.001	20.48 (6.28)	24.88 (4.73)	.01