dosing, product identification, and routes of administration. In subsequent waves, the TLFB interview will be utilized to cover measurement of substance use patterns across all ten years to ensure continuous coverage. After the patterns of use are assessed, measures related to risk for substance use initiation and problematic substance use trajectories (e.g., intention to use, acute subjective response, peer use, peer tolerance of use, perceived harm, expectancies), along with substance use consequences (e.g., alcohol hangover symptoms, symptoms of alcohol, cannabis, nicotine and drug use disorders) are administered. The baseline substance use battery takes an average of approximately 9 min for 9 and 10 year olds to complete; with a range between 2 and 19 min (depending on processing speed, how many substances the youth heard of, and if they were current users) and is administered between the first section of the neuropsychological testing and the mental health module.
