Table 1.

Breakdown of datasets used in the current study

Dataset	N	Population	IGT Version	Study Citation
Kjome	19	Healthy	Modified	Kjome et al. (2010)
Premkumar	25	Healthy	Modified	Premkumar et al. (2008)
Wood	153	Healthy	Modified	Wood et al. (2005)
Worthy	35	Healthy	Original	Worthy et al. (2013b)
Ahn	48	Healthy	Modified	Ahn et al. (2014)
Ahn	38	Amphetamine	Modified	Ahn et al. (2014)
Ahn	43	Heroin	Modified	Ahn et al. (2014)
Fridberg	15	Healthy	Original	Fridberg et al. (2010)
Fridberg	17	Cannabis	Original	Fridberg et al. (2010)