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. Author manuscript; available in PMC: 2018 Jul 1.
Published in final edited form as: Psychol Sci. 2017 May 16;28(7):907–920. doi: 10.1177/0956797617698139

Table 1.

Demographic information for the four experimental groups.

tDCS + WM
(n=32)		 tDCS + control
(n=30)		 sham + WM
(n=33)		 sham + control
(n=28)
Mean SD Mean SD Mean SD Mean SD
Age (years) 69.31 2.73 69.87 2.91 69.64 2.97 69.82 2.62
Sex (f/m) 16/16 17/13 22/11 16/12
Education (years) 15.05 3.19 14.29 2.29 14.68 2.86 15.84 4.09
Physical activity (score)1 2.13 0.71 2.21 0.78 2.30 0.64 2.29 0.66
Reasoning ability (score)2 7.06 2.72 6.97 3.02 6.88 2.36 6.93 2.26
Drop-out (n subjects)3 4 5 4 4
1

1<150 min/week, 2>150 min/week, 3>200 min/week.

2

Ravens Progressive Matrices score (max = 18).

3

Number of drop-outs after entry into the study, reported in addition to final sample size (n)