Table 1 Summary of primary, secondary and tertiary outcome measures, potential mediating and risk factors, and data collection time points
Outcome measure | Baseline | Post (Stage I) | 6 months | 12months | Post (Stage II)a | 24 months | 36 months | 48 months | 60 months | |
|---|---|---|---|---|---|---|---|---|---|---|
Primary outcome measure | ||||||||||
 Depression | Patient Health Questionnaire: Adolescent Version (PHQ-A) | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
Secondary outcome measures | ||||||||||
 Psychological distress | Distress Questionnaire 5 (DQ5) | ✓ | ✓ | – | ✓ | – | ✓ | ✓ | ✓ | ✓ |
 Anxiety | Spence Children’s Anxiety Scale (SCAS) including Generalized Anxiety and Social Phobia subscales | ✓ | ✓ | – | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
 Insomnia | Insomnia Severity Index (ISI) | ✓ | ✓ | – | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
Tertiary outcome measures, potential mediating variable risk factors | ||||||||||
 Suicidal ideation | Suicidal Ideation Attributes Scale (SIDAS) | ✓ | ✓ | – | ✓ | – | ✓ | ✓ | ✓ | ✓ |
 Suicide behaviour | Youth Risk Behaviour Survey (YRBS) | ✓ | ✓ | – | ✓ | – | ✓ | ✓ | ✓ | ✓ |
 Externalising behaviours | Strength and Difficulties Questionnaire (SDQ) | ✓ | ✓ | – | ✓ | – | ✓ | ✓ | ✓ | ✓ |
 Eating disorders | Screen for Disordered Eating (SDE) | ✓ | ✓ | – | ✓ | – | ✓ | ✓ | ✓ | ✓ |
 Self-harm | Single question from Self-Harm Questionnaire | ✓ | ✓ | – | ✓ | – | ✓ | ✓ | ✓ | ✓ |
 Alcohol use | Questions from previous National Drug and Alcohol Research Centre, UNSW studies | ✓ | ✓ | – | ✓ | – | ✓ | ✓ | ✓ | ✓ |
 Other substance use | Questions from Australian Institute of Health and Welfare 2007 National Drug Strategy Household Survey | ✓ | ✓ | – | ✓ | – | ✓ | ✓ | ✓ | ✓ |
 Psychosis | Adolescent Psychotic-like Symptom Screener (APSS) | ✓ | ✓ | – | ✓ | – | ✓ | ✓ | ✓ | ✓ |
 Sleep quality | Pittsburgh Sleep Quality Index (PSQI) | ✓ | ✓ | – | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
 Quality of life | Child Health Utility 9D (CHU-9D) | ✓ | ✓ | – | ✓ | – | ✓ | ✓ | ✓ | ✓ |
 Well-being | Short-form Warwick–Edinburgh Mental Well-Being Scale (SWEMWBS) | ✓ | ✓ | – | ✓ | – | ✓ | ✓ | ✓ | ✓ |
 Demographics | Age, ethnicity, location, language, perceived socio-economic status | ✓ | – | – | – | – | – | – | – | – |
 Height and weight | Height (cm), weight (kg) | ✓ | – | – | ✓ | – | ✓ | ✓ | ✓ | ✓ |
 Personality | Big Five Inventory-10 (BFI-10) | ✓ | – | – | – | – | – | – | – | – |
 School connectedness | Items from OECD Programme for International Student Assessment (PISA) | ✓ | ✓ | – | ✓ | – | ✓ | ✓ | ✓ | – |
 Social support | Schuster Social Support Scale (SSSS) | ✓ | ✓ | – | ✓ | – | ✓ | ✓ | ✓ | ✓ |
 Social media use | Maladaptive Facebook Use Survey (MFUS), adapted to apply to social media use more broadly | ✓ | ✓ | – | ✓ | – | ✓ | ✓ | ✓ | ✓ |
 Gender identification | Sex at birth and current gender identification | ✓ | – | – | ✓ | – | ✓ | ✓ | ✓ | ✓ |
 Sexual identification and preferences | Single item for each | ✓ | – | – | ✓ | – | ✓ | ✓ | ✓ | ✓ |
 Sexual behaviour | History of sexual behaviour | – | – | – | – | – | ✓ | ✓ | ||
 Romantic relationships | History of romantic relationships | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | |||
 Trauma | Adapted Behavioural Risk Factor Surveillance System—Adverse Childhood Experience (BRFSS-ACE) | ✓ no abuse items | – | – | – | – | – | – | ✓ | – |
 History of diagnosed mental health condition | Diagnosed mental health conditions | ✓ | ✓ | – | ✓ | – | – | – | ✓ | ✓ |
 Hospitalisation | History of hospitalisation | ✓ | ✓ | – | ✓ | – | – | – | ✓ | ✓ |
 History of diagnosed disability | Diagnosed disability | ✓ | – | – | – | – | – | – | ✓ | – |
 Pubertal development | Menarche, voice-breaking and Tanner stages | ✓ | – | – | ✓ | – | ✓ | ✓ | ✓ | ✓ |
 Bullying | From previous school trials | ✓ | ✓ | – | ✓ | – | ✓ | ✓ | ✓ | ✓ |
App feedback/acceptability | ||||||||||
 App feedback | Future Proofing App Feedback Survey | – | ✓ | – | – | – | – | – | – | – |
 App feedback | Post-intervention SPARX-FP Feedback Survey | – | ✓ | – | – | – | – | – | – | – |