2.2. Data collection procedure

Participants were recruited at the age 20 main data collection wave of z‐proso in 2018 and those who agreed to participate were followed up and provided with information on how to participate in an EMA sub‐study. The study was delivered via an application provided by LifeDataCorp LLC downloaded to participant smartphones. It involved completing brief surveys 4 times a day over a 2‐week period. The surveys were delivered using a signal‐contingent design on a quasi‐random schedule (random within four time windows within each day) between 10 am and 10 pm each day. The average response latency (time between receiving and answering a prompt) was 25 min and respondents could respond up to 2 h after a prompt was issued. Each survey was designed to take <2 min and included questions on current context, substance use, provocations, stress, aggression, and affect. The full questionnaire is provided in Supplementary Materials: https://osf.io/ez879.

Participants received an incentive for their participation, scaled to the level of response up to a maximum of 50CHF for onboarding and completing >70% of the surveys in both week 1 and week 2 of the study. Specifically, participants received 10CHF for downloading the application and setting up the study, 10CHF for achieving a response rate of at least 70% in week 1, and 20CHF for achieving a response rate of at least 70% in week 2. All participants were offered the same incentive structure. The study was implemented by the Decision Science Laboratory group at the Swiss Federal Institute for Technology (ETH), Zurich, Switzerland. Participants could contact an email helpline at any stage during the study if they encountered any difficulties.