Demographic statistics of the participants from the four countries.

Note: Percentages are based on available cases (missing values omitted) Regular use is defined as use at least once per month; Number of use days is an aggregated version of the number of use days predictor used in the analysis, which has 12 levels; Lifetime use refers to any use/incidence of use; Cannabis use on weekdays refers to the question whether participants use cannabis in the weekends only, or also (or mainly) on working days; Presented in the proportion indicating that they use cannabis also/mainly on weekdays; Cannabis use any time of day refers to the question whether participants use cannabis on a specific time of the day or not; Presented is the proportion indicating that they use cannabis on any time of the day; Sample sizes of the four countries (and combined) are lower than the indicated number for some variables due to item missingness. F tests and chi-squared tests were performed to test the difference between the four countries. Samples are not representative of the general population in any of the four countries. Demographic statistics of the participants from the four countries.