Table 1. Comparison of 5-HTTLPR group characteristics.

Measure	5-HTTLPR genotype		P
	ll Group (N=16), mean (s.d.)	ss/sl Group (N=20), mean (s.d.)
Age	73.85 (5.20), range=63–84	72.30 (6.58), range=64–86	0.43
% Male	44%	50%	0.72
# Motion artifacts during fMRI	11.20 (13.9)	16.30 (16.84)	0.33
fMRI face–name memory task: accuracy of recognition (percent correct)	61.13 (9.09), range=42.71–75.00	62.14 (8.27), range=47.92–75.00	0.73
fMRI face–name memory task: response time during recognition trials (ms)	2036.86 (285.74), range=1197–2364	2005.84 (254.20), range=1556–2574 ms	0.74

Abbreviations: fMRI, functional magnetic resonance imaging; 5-HTTLPR, serotonin transporter gene; l, long allele; s, short allele; s.d., standard deviation.