National Brain Health Platform
Child and Adolescent Cohort Data Catalogue.
An English-language catalogue of standardized instruments and thematic modules used across primary, middle, and high school surveys. Chinese source wording has been translated into scientific English at the instrument and construct level; the public page emphasizes interpretable modules rather than displaying hundreds of raw questionnaire columns.
Assessment timeline
Open each collection period to understand what the data represent.
Collection periods are kept distinct whenever sampling, questionnaire content, linkage certainty, or deep-phenotyping availability differs.
2024Cross-sectional school surveyOpen
Primary, middle, and high school students.
41,142 participants, presented by educational stage.
Demographics, household composition, socioeconomic circumstances, school context, lifestyle, sleep, mental health, pain, and related developmental measures.
Potential linkage fields exist, but no public longitudinal interval or matched sample is asserted until dedicated validation is complete.
No deep-phenotyping programme is reported for this collection period.
Current collectionExpanded child and adolescent assessmentOpen
Primary and middle school students in the current cleaned datasets, with adolescent modules extending into older age groups.
10,912 participants in the current interim summary.
Expanded family, school, bullying, sleep, pain, mental health, digital behaviour, and detailed AI-use modules.
Data sources remain separately identified from the 2024 survey; linkage will be reported only after identifier, consent, and interval validation.
Deep-phenotyping components are being prepared for selected participants.
Next fieldwork milestoneProgramme expansionOpen
Additional children and adolescents across educational stages.
Approximately 20,000 additional participants are expected as fieldwork continues.
The core questionnaire framework will be retained, with refinements based on developmental stage and emerging social issues.
Future follow-up and linkage schedules will be published after study procedures are finalized.
Planned modules include EEG, fNIRS, speech and facial-expression features, blood samples, and related biological measures.
Instrument and module catalogue
Browse standardized scales and distinctive thematic modules.
Standard instruments and context-specific modules are presented at the same level. This makes family economics, parental migration, bullying, AI use, and educational context visible alongside depression and anxiety scales.
This public catalogue describes questionnaire content and data structure. Item-level wording, response counts, derived-score code, and wave-specific codebooks remain part of the governed research documentation.
Measurement domain
Population and family context
4 instruments or thematic modulesPopulation and family contextDemographic and physical development profile View details
Age, sex, ethnicity, educational stage, grade, height, weight, BMI, myopia, and pubertal-development indicators.
Primary, middle, and high school students; selected puberty items are sex-specific
2024 survey and current data collection
Multiple single-item variables
Categorical responses, dates, and numeric measurements
Descriptive variables; age and BMI can be derived after quality control.
Available by educational stage; completeness differs across collection periods.
School stage, physical activity, sleep, mental health, pain, and family context.
Population and family contextHousehold composition and caregiving arrangements View details
Co-residence with parents, grandparents, and other relatives; sibling composition; parental marital status; and family relationship climate.
Primary, middle, and high school students
2024 survey and current data collection
Multiple household and family-relationship items
Multiple-response household membership and categorical family variables
Derived indicators may include two-parent co-residence, single-parent co-residence, grandparent caregiving, and sibling categories.
Available in both survey sources.
Parental migration, socioeconomic circumstances, parenting, bullying, resilience, and mental health.
Population and family contextFamily socioeconomic circumstances View details
Parental educational attainment, parental occupation, perceived family economic position, and annual per-capita disposable household income.
Primary, middle, and high school students
2024 survey and current data collection
Multiple socioeconomic indicators
Ordered education and income categories, occupational groups, and perceived economic ratings
Indicators can be analysed separately or combined into a prespecified family socioeconomic index.
Available in current questionnaires; the exact set differs across collection periods.
Residential setting, caregiving arrangement, academic performance, bullying, sleep, depression, and anxiety.
Population and family contextParental migration and left-behind childhood experience View details
Prolonged parental employment away from home, duration of parental absence, and alternative caregiving arrangements.
Children and adolescents where the module is administered
Current questionnaire framework
Branching family-migration module
Parent-specific absence indicators and duration categories
No parental migration, father away, mother away, both parents away, and duration-based exposure variables.
Questionnaire-derived; public counts will be added after module-specific quality control.
Household composition, family relationships, socioeconomic circumstances, social support, resilience, and mental health.
Measurement domain
School and peer environment
3 instruments or thematic modulesSchool and peer environmentSchool participation and academic context View details
Educational stage, grade, boarding status, school transfer, self-reported academic performance, weekend study, extracurricular activity, and school adjustment.
Primary, middle, and high school students
2024 survey and current data collection
Multiple school-context variables
Categorical responses, multiple-response items, and performance bands
Variables are generally analysed separately or combined into prespecified school-context profiles.
Available across survey sources with differing detail.
Academic pressure, sleep, screen time, bullying, social support, depression, and anxiety.
School and peer environmentBullying victimization and perpetration View details
Frequency, type, and duration of bullying victimization and bullying perpetration during the previous school year.
Primary and middle school students; selected items extend to older adolescents
Current data collection
Screening questions plus type- and duration-specific follow-up items
Frequency categories, multiple-response bullying types, and duration categories
Victimization and perpetration frequency indicators; recurrent bullying can be defined prospectively.
Available in the current cleaned datasets.
Peer relationships, school adjustment, depression, anxiety, self-harm, pain, sleep, and resilience.
School and peer environmentPeer relationships and social functioning View details
Close friendships, peer integration, social difficulties, supportive relationships, and behavioural functioning.
Primary and middle school students
Current data collection
Multiple social and behavioural items
Categorical and Likert-type responses
Item-level indicators or instrument-specific subscales after codebook verification.
Available; module coverage varies because of questionnaire branching and collection progress.
Bullying, family relationships, resilience, school belonging, depression, and anxiety.
Measurement domain
Mental health and psychological resources
7 instruments or thematic modulesMental health and psychological resourcesCenter for Epidemiologic Studies Depression Scale for Children View details
Depressive affect, positive affect, somatic complaints, and interpersonal symptoms during the previous week.
Primary and middle school students
Current data collection
20 items
Four-point frequency scale
Total score 0-60 after reverse scoring the positively worded items.
Available in the current questionnaire framework.
PHQ-9, anxiety, sleep, bullying, pain, resilience, and family context.
Mental health and psychological resourcesPatient Health Questionnaire-9 View details
Depressive symptoms during the previous two weeks.
Middle school students and older adolescents
Current data collection
9 items
0-3 frequency scale
Total score 0-27; item-level interpretation and thresholds should follow the analysis protocol.
Available in the middle school questionnaire dataset.
CES-DC, GAD-7, self-harm and suicide-related assessment, sleep, bullying, pain, and AI use.
Mental health and psychological resourcesGeneralized Anxiety Disorder-7 View details
Anxiety symptoms during the previous two weeks.
Middle school students and older adolescents
Current data collection
7 items
0-3 frequency scale
Total score 0-21 using the standard GAD-7 algorithm.
Available in the middle school questionnaire dataset.
PHQ-9, SCARED, sleep, bullying, pain, resilience, and digital behaviour.
Mental health and psychological resourcesScreen for Child Anxiety Related Emotional Disorders View details
Panic/somatic symptoms, generalized anxiety, separation anxiety, social anxiety, and school avoidance.
Primary and middle school students
Current data collection
41 items
0-2 frequency/severity scale
Total and subscale scores using the standard SCARED scoring structure.
Available in the questionnaire framework; completion differs by educational stage.
GAD-7, depressive symptoms, school avoidance, bullying, sleep, pain, and family context.
Mental health and psychological resourcesSelf-harm and suicide-related assessment View details
Thoughts of self-harm or giving up, passive and active suicide-related thoughts, planning, duration, frequency, and previous attempts.
Middle school students and older adolescents where administered
Current data collection
Branching module; item count depends on responses
Yes/no, graded ideation categories, timing, frequency, duration, and event counts
Separate indicators for self-harm thoughts, passive death wishes, active ideation, planning/preparation, and attempts; branching rules must be retained.
Available in the revised adolescent questionnaire; public outcome estimates require dedicated quality control.
PHQ-9 item 9, depression, anxiety, bullying, sleep, pain, family context, and clinical assessment.
Mental health and psychological resourcesBrief Resilience Scale View details
Perceived ability to recover from stress and adversity.
Primary and middle school students
Current data collection
6 items
Five-point agreement scale
Mean or total score after reverse scoring negatively worded items.
Available in current questionnaire datasets.
Family support, bullying, academic stress, depression, anxiety, sleep, and recovery trajectories.
Mental health and psychological resourcesBrief personality profile View details
Extraversion, openness, agreeableness, conscientiousness, and neuroticism.
Primary and middle school students
Current data collection
5 broad-trait items
Four-point self-description scale
Trait-specific item scores; this brief profile should not be treated as a full-length personality inventory.
Available in current cleaned datasets.
Resilience, social functioning, bullying, academic performance, digital behaviour, and mental health.
Measurement domain
Sleep and circadian health
3 instruments or thematic modulesSleep and circadian healthPittsburgh Sleep Quality Index View details
Sleep quality, latency, duration, efficiency, disturbances, medication use, and daytime dysfunction during the previous month.
Primary and middle school students where administered
Current data collection
19 self-rated items
Clock times, durations, and 0-3 frequency/severity categories
Seven component scores and a global score using the standard PSQI algorithm.
Available with stage-specific completion patterns.
Chronotype, MCTQ, depression, anxiety, screen time, pain, and planned PSG/EEG.
Sleep and circadian healthMorningness-Eveningness Questionnaire, 5-item version View details
Preferred sleep-wake timing, morning alertness, evening sleepiness, peak performance time, and self-identified chronotype.
Middle school students and older adolescents
Current data collection
5 items
Time bands and categorical chronotype responses
Five-item chronotype score according to the validated short-form algorithm.
Included in the adolescent questionnaire framework.
MCTQ, PSQI, screen time, school schedule, mood, and academic functioning.
Sleep and circadian healthMunich Chronotype Questionnaire for school schedules View details
Bedtime, sleep preparation, sleep latency, wake time, rise time, alarm use, and napping on school days and free days.
Primary and middle school students where administered
Current data collection
Timing sequence for school days and free days
Clock times, minutes, yes/no responses, and days/week
Sleep duration, midpoint of sleep, and social jetlag variables.
Available with stage-specific completion patterns.
MEQ-5, PSQI, screen time, physical activity, depression, anxiety, and actigraphy.
Measurement domain
Pain and somatic health
2 instruments or thematic modulesPain and somatic healthRecurrent pain assessment View details
Pain occurrence over the previous three months, duration, frequency, anatomical sites, intensity, and functional interference.
Primary and middle school students
Current data collection
Branching pain module
Yes/no, duration categories, body locations, and 0-10 intensity/interference ratings
Pain presence, number of sites, severity, chronicity, and interference indicators.
Available in the current questionnaires.
Sleep, depression, anxiety, bullying, physical activity, somatic symptoms, and health anxiety.
Pain and somatic healthSomatic symptoms and health anxiety View details
Physical complaints, fatigue, concern about bodily symptoms, illness interpretation, and symptom-related interference.
Primary and middle school students
Current data collection
Multi-item symptom and health-concern modules
Frequency, severity, duration, and Likert-type agreement responses
Instrument-specific totals or domain scores after codebook and psychometric verification.
Available; item completion varies by questionnaire branch.
Pain, sleep, depression, anxiety, healthcare use, and family context.
Measurement domain
Lifestyle, digital behaviour, and AI
3 instruments or thematic modulesLifestyle, digital behaviour, and AIPhysical activity and sedentary behaviour View details
Moderate and vigorous activity, walking, strength exercise, outdoor time, study-related sitting, recreational screen time, and sedentary breaks.
Primary and middle school students
Current data collection
Activity and sedentary-behaviour module
Days/week, minutes/day, intensity, and participation categories
Activity volume and sedentary-time variables using a prespecified derivation protocol.
Available; objective activity monitoring is planned for selected subsamples.
BMI, sleep, pain, depression, anxiety, screen time, and actigraphy.
Lifestyle, digital behaviour, and AIInternet Addiction Test and recreational screen use View details
Screen exposure on school and non-school days, loss of control, preoccupation, sleep disruption, social displacement, and functional interference.
Primary and middle school students
Current data collection
20-item IAT plus screen-time variables
Time categories and five-point frequency ratings
IAT total score and separate screen-time indicators.
Available in current questionnaire datasets.
Sleep timing, academic performance, bullying, loneliness, depression, anxiety, and AI use.
Lifestyle, digital behaviour, and AIArtificial intelligence use, attitudes, and digital literacy View details
Frequency and duration of AI use, access to devices, purposes of use, use for schoolwork, trust, verification practices, emotional reliance, loss of control, perceived harms, and guidance on safe use.
Middle school students and older adolescents
Current data collection; adaptable module
Detailed multi-part thematic module
Frequency and duration categories, multiple-response purposes, and Likert-type attitude statements
Item-level indicators and future psychometrically derived dimensions for functional use, critical literacy, reliance, and problematic use.
Available in the middle school questionnaire dataset; module content may evolve with technology and social context.
Academic performance, screen time, sleep, mental health, digital literacy, family guidance, and school policy.