Table 2.

Main outcomes of the JOiN study assessed at T1 and/or T2

Behaviour	Data-wave	Instrument
Alcohol use disorder: symptoms of abuse and dependence	T1	Adolescent: DISC [19], Parent: CIDI [20].
Cannabis use disorder: symptoms of abuse and dependence	T1	Adolescent: DISC [8,19], Parent: CIDI [20].
Other substance use disorder: symptoms of abuse and dependence	T1	Adolescent: DISC [8,19], Parent: CIDI [20].
Ever use of nicotine, alcohol, cannabis or other drugs	T1, T2	Self-reported Substance Use Questionnaire
Age of onset of nicotine, alcohol, cannabis or other drugs	T1, T2	Self-reported Substance Use Questionnaire
Frequency and quantity of use of nicotine, alcohol, cannabis or other drug use	T1, T2	Self-reported Substance Use Questionnaire
Level of drunkenness or being stoned last time alcohol or cannabis were used	T1, T2	Self-reported Substance Use Questionnaire