Data Conventions
Data Dictionary
In Progress: Details are subject to change based on ongoing review; may not reflect the latest updates.
The data dictionary describes the structure and meaning of variables included in each data release. It includes study and table metadata, variable names and descriptions, item text, data and measurement types, categorical value labels, units, and instrument administration properties, when applicable.
Data dictionary elements#
| Dictionary Element | Description |
|---|---|
| Dataset metadata | |
domain | Data domain associated with the table or variable (see Naming Convention) |
identifier_column | Column(s) used to identify a participant and/or observation (e.g. participant ID, session ID) |
source | Source or respondent providing the information: Caregiver (cg), Child (ch), or Research assistant (ra) |
study | Study name |
| Table metadata | |
table_name | Name of the data table containing the variable (e.g., gen_cg_demo) |
table_label | Human-readable label for the data table (e.g. Demographics) |
url_table | URL for the table/instrument README in data release documentation |
url_table_warning | URL for responsible use and/or data usage warnings in data release documentation |
| Variable metadata | |
name | Name of the variable as it appears in the data table (e.g., gen_cg_demo_child_agecat_db) |
description | Human-readable description or label for the variable (e.g. Age of child at screening) |
instruction | Item text or instruction presented to the participant, when applicable |
levels | Values and corresponding labels for categorical variables |
type_data | Data type of the variable (e.g. date, text, integer, double) |
type_level | Level of measurement (e.g. nominal, ordinal, interval, ratio) |
type_var | Functional type of the variable (e.g. administrative, item, derived item, summary score) |
unit | Unit in which the variable is measured, when applicable (e.g. years, cm, lb) |
| Instrument administration metadata | |
branching_logic | Logic or condition determining whether the item is presented to a participant |
order_display | Order in which the item is presented within the instrument or measure |
type_field | Input or field type used to collect the response (e.g. dropdown, radio button, checkbox) |
| Imaging-specific metadata | |
atlas | Atlas used for parcellated functional timeseries, cortical fiber tracts, etc. |
metric | Specific assessment metric (cortical thickness, fractional anisotropy, etc.) |
sub_domain | Imaging domain subcategory (Structural MRI, Resting State fMRI, Diffusion, etc.) |