Genetic contributions to attentional response time slopes across repeated trials

BMC Neuroscience

Table 13 Comparison of these two recruiting sources

	T	df	Sig. (2-tailed)	Mean difference	Std. error difference
Age	−9.89	54.95	0.00	−14.89	1.51
Gender	−0.34	145	0.73	−0.03	0.09
APOE	0.78	133	0.44	0.08	0.10
COMT	0.31	143	0.76	0.03	0.11
DAT1	−0.30	138	0.77	−0.03	0.10
DBH	1.50	142	0.14	0.19	0.12
DRD4	−2.31	132	0.02	−0.32	0.14

The two recruiting sources were Rice University students and subjects recruited from a suburb of Houston. As can be seen, the subjects from the two groups differed on age (the suburb sample was older) and DRD4 genotype. Multilevel modeling accounts for the fact that trials are not independent (certain trials come from certain individuals) and so these differences are less of a concern than they might be with other statistical analyses

ISSN: 1471-2202