Table 1.

List of included instruments and assessed variables

Questionnaires/Measurements	Contents
Screening Stage
Youth Self-Report (YSR)	General Psychopathology, Behavioral and emotional problems
SCOFF	Screening Tool for Eating disorders
KIDSCREEN (KS) 52/27/10	Health-related Quality of Life (HrQoL)
	General HrQoL (KS-10), Self-Perception (KS-52), Parent Relation & Home Life (KS-52), Social Support & Peers (KS-27), School Environment (KS-27), Bullying (KS-52)
Headache Questionnaire	Migraine, Tension type Headache
Family Affluence Scale (FAS I, II)	Socioeconomic status
Sociodemographic variables	Sex, school grade, school type, Austrian state, class repetition, birth months and year, country of birth, parental country of birth, other people who live in the same household, occupation of parents, availability of an attachment figure
Other health-related variables	Current height & weight, self-perception of weight, diagnosed chronic somatic and psychiatric diseases (including onset of disease, use of medication, necessity of consulting health services regularly), diagnosed chronic somatic and psychiatric diseases of parents and siblings, life-time experiences of traumatic and burdening events
Interview-stage
Kinder-DIPS	Structural diagnostic interview for psychiatric disorders in childhood and adolescents based on DSM-5 criteria including following disorders:
	Disorders assessed from adolescents’ interview: Specific Phobia, Social Anxiety Disorder, Generalized Anxiety Disorder, Panic Disorder, Agoraphobia, Obsessive-compulsive Disorder, Posttraumatic Stress Disorder, Major Depressive Disorder, Non-suicidal Self-Injury, Suicidal Behavior Disorder, Anorexia Nervosa, Bulimia Nervosa, Binge-Eating Disorder, Internet Gaming Disorder; Screening for alcohol, nicotine and drug abuse, Screening for non-organic psychosis
	Disorders assessed from parents’ interview: Attention-Deficit/Hyperactivity Disorder, Oppositional Defiant Disorder, Conduct Disorder, Tic Disorders (Tourette’s Disorder, Persistent Motor or Vocal Tic Disorder, Provisional Tic Disorder), Separation Anxiety Disorder, Selective Mutism, Disruptive Mood Dysregulation Disorder, Enuresis, Encopresis, Pica, Rumination Disorder, Avoidant/Restrictive Food Intake Disorder
	Severity of diagnosis based on clinical judgment (rated on a scale from 0 to 9)
	General assessment of the functioning level based on clinical judgment (rated on a scale from 0 to 100)
Treatment history & Help seeking	Use of any mental health service, type of therapy, type of care (inpatient/outpatient), duration and frequency of therapy, satisfaction with treatment, perceived benefit of the treatment, use of medications, help/treatment seeking (yes/no), reasons why no help/treatment is sought
Additional variables assessed in adolescents’ interview	School problems, school absenteeism, media consumption (time spent with watching television, gaming on computer/game console/mobile phone, using internet/social media, contacting friends by phone/short messages/emails), life-time history of pregnancy (for girls from age 14), cramped living conditions, frequency and burden of family conflicts
Additional variables assessed in parents’ interview	Sociodemographic information: Age of parents, sex and age of siblings, family structure (people in the same household, civil status), highest educational attainment of parents, occupation of parents and working hours, occupation of mother in the first year of child, approximate household income, first language of child and language that is mainly spoken at home, relocation with child associated with change of school, adolescents’ affiliation to a religious community and exercise of religious beliefs
	Childrens’ early development: complications in pregnancy and during birth, Alcohol and nicotine consumption of mother during pregnancy, abnormalities in early childhood development, problems with speaking
	Life-time history of chronic diseases and severe accidents
Interview-Evaluation	Short qualitative interview regarding the preceding interview based on three levels 1. Content (of questions) 2. Feelings 3. Situation (Interviews by telephone)