Table 2. Stage 2 Measurements in the WARN-D Study.

Category	Examples
Mental health	Stress and stress domains, mental health and interference with daily activities, depression and anxiety symptoms, bad dreams, non-suicidal self-injury
Positive and negative affect	Happy/cheerful, motivated, relaxed, stressed, sad, nervous/anxious, overwhelmed, annoyed/irritated
Satisfaction and wellbeing	Ability to concentrate, feeling productive, general satisfaction
Physical experiences	Physical health and interference with daily activities, pain/discomfort, sleep, substance use, menstruation, sleep and tiredness
Experiences	Best and worst experiences of the day and the week, category of experiences such as finances, education, and love life
Social experiences	Feeling connected to others, being able to rely on others for support, current social offline/online contact, social media use
Context	Current activity and enjoyment of activity, current location
Coping and Appraisal	Being able to handle daily and weekly challenges, emotion regulation
Meta	Enjoying study participation, reasons for missing surveys
Garmin smartwatch	Heart rate (constant, daily resting), blood oxygen saturation monitor, energy monitor, stress, body battery, sleep, step counter

Note. For a full list of variables, phrasing, response options, and translations, see codebook in the Supplementary Materials.