Table 1.

The psychiatric assessment instruments included in the self-report questionnaire used in phase 1, including reference period and ‘at-risk score’ used to select participants for diagnostic interviews

Instrument	Abbreviation	Domain	Reference period	Clinical cut-off score/at-risk score
Hopkins Symptoms Check List—10-item version	HSCL-10	Symptoms of depression and anxiety disorders	Last 7 days	≥1.85 (average score)
Bergen Insomnia Scale	BIS	Symptoms of problems related to sleep (insomnia)	Last month (days per week)	≥3 on one of the items 1–4 and ≥3 on one of the items 5–6
The Eating Disorder Examination—Questionnaire Short	EDE-QS	Symptoms of eating disorders	Last week	≥15 (total score)
Canadian Problem Gambling Index	CPGI	Symptoms of gambling disorder	Last 12 months	≥3 (total score) 3–7=moderate risk-gambler 8–27=problem gambler
The Alcohol Use Disorders Identification Test—Consumption	AUDIT-C	Identifies hazardous drinkers or active alcohol use disorders (including alcohol abuse or dependence)	Present usage? Yes/No How often (weekly/monthly)? How much?	Male: ≥4 (total score) 4–7=increased risk 8–12=high risk Female: ≥3 (total score) 3–7=increased risk 8–12=high risk
Drug Use Disorders Identification Test	DUDIT	Symptoms of substance abuse, harmful use and drug dependence	Present usage? Y/N How often (weekly/ monthly)? How much?	Male: ≥6 (total score) Female: ≥2 (total score)

The instruments were selected after consulting experts in Norway at the following institutions: Norwegian Institute of Public Health, National Competence Center for Sleep Disorders, Regional Center for Eating Disorders (RASP), Department of Psychosocial Science of University of Bergen, Norwegian Centre for Addiction Research and Norwegian National Advisory Unit on Concurrent Substance Abuse and Mental Health Disorders. Four aspects were given priority when selecting the instrument. (1) Is the instrument validated for the Norwegian population? (2) Is the instrument used in research on the general population in Norway? (3) Do the different experts recommend the instrument? (4) Is the number of items acceptable? For more information about the instruments, see online supplemental appendix 1.