. Author manuscript; available in PMC: 2020 Sep 1.

Published in final edited form as: Psychopharmacology (Berl). 2019 Mar 27;236(9):2635–2640. doi: 10.1007/s00213-019-05235-x

Table 2.

Time Since Last Exposure to Cannabis and Lifetime Exposure

Time Since Last Exposure to Cannabis
1 day to 1 week	2
1week to 1 month	5
1 month to 1 year	2
1 year to 5 years	1
Lifetime Exposure to Cannabis
Number of exposures
Less than 5 times	1
5–10 times	0
11–20 times	0
20–50 times	2
51–100 times	3
More than 100 times	4
Number of frequent users	2

Frequent users were defined as (1) lifetime cannabis exposure greater than or equal to 100 times, (2) last exposure to cannabis within the past week, (3) recent cannabis exposure greater than ten times per month as quantified by Time Line Follow Back and (4) positive urine toxicological test for cannabis at screening.