Page Last Updated: November 29, 2025

Study Instruments🔗

The current release includes data from Visits 1, 2, and 3 (V01, V02, and V03) for the majority of measures. In this section we provide a brief overview of each study instrument provided in the data release, including, where applicable, details of implementation and data collection, scoring procedures, quality control procedures, data and responsible use warnings, and references. Full study protocols are available on the HBCD Study site. See Pending Updates for details on what to expect in future releases.

Age Of Child at Each Visit🔗

Visit 1 (V01)	Visit 2 (V02)	Visit 3 (V03)	Visit 4 (V04)	Visit 5 (V05)	Visit 6 (V06)	Visit 7 (V07)
Prenatal	0-1 month	3-9 months	9-15 months	10-17 months	15-30 months	16-32 months

Data Collected at Visits🔗

Age of Child participants at each Visit number: Visit 1 (V01) = Prenatal; Visit 2 (V02) = 0-1 month old; Visit 3 (V03) = 3-9 months old; Visit 4 (V04) = 9-15 months old; Visit 5 (V05) = 10-17 months old; Visit 6 (V06) = 15-30 months old; Visit 7 (V07) = 16-32 months old

Data Types Included in Release🔗

HBCD Study data includes both tabulated and file-based data - see Data Structure Overview for details. In summary:

Tabulated data contain data across all participants organized according to a standardized tabulated format for HBCD (includes Behavior, Biospecimens, Demographics, data derived from file-based MR/EEG data, etc.).
File-based data are in varied, modality-specific formats. This includes raw BIDS data and processed derivatives organized under subject/session-level folders (MRI/MRS, EEG, and Wearable Sensors).

Expand the sections below to see a list of measures associated with each domain included in the latest release data.

Instruments by Domain🔗

Expand the sections below to see a list of measures associated with each domain included in the latest release data.

	Instrument	Construct	Tabulated Data Table Name
Tabulated Data	Basic Demographics	Demographics data derived from multiple sources	`sed_basic_demographics`
Tabulated Data	Visit Information	Participant visit information	`par_visit_data`

Behavior, Biology, & Environment🔗

	Instrument	Version	Construct	Tabulated Data Table Name
Tabulated Data	ecPROMIS-Ch/CG Interaction	<1 year	Child/Caregiver Relationship	`mh_cg_pms__cc__inf`
Tabulated Data	BQ (VSF)+BI	IBQ-R (VSF)+BI (Infant)	Surgency/Extraversion, Negative Affectivity, Effortful Control, Behavioral Inhibition	`mh_cg_ibqr`
Tabulated Data	MAPS-TL	Infancy (< 1 year)	Irritability	`mh_cg_mapdb__inf`

	Instrument	Version	Construct	Tabulated Data Table Name
Tabulated Data	Nails	Maternal	Drug, Environmental Exposure	`bio_bm_biosample_nails_results` `bio_bm_biosample_nails_type`
Tabulated Data	Urine	Maternal	Drug Panel, Toxins	`bio_bm_biosample_urine`

	Instrument	Version	Construct	Tabulated Data Table Name
Tabulated Data	MLDS		Multilingual Exposure	`ncl_ch_mlds`
Tabulated Data	SPM-2	Infant	Sensory Processing/Integration	`ncl_cg_spm2__inf`

	Instrument	Construct	Tabulated Data Table Name
Tabulated Data	2-item Food Insecurity	Food Insecurity	`sed_cg_foodins`
Tabulated Data	Breast Feeding History	Nutrition	`ph_cg_phx__bfh`
Tabulated Data	Height/Weight/Head Circumference	Growth	`ph_ch_anthro`

	Instrument	Ver	Construct	Tabulated Data Table Name
Pregnancy & Infant Health
Tabulated Data	Health V1-Health History		Pre-pregnancy and pregnancy health	`pex_bm_health_preg__healthhx`
Tabulated Data	Health V1-Exp & Vaccines		Vaccines in pregnancy	`pex_bm_health_preg__exp__vacc`
Tabulated Data	Health V1-Chronic Conditions		Chronic conditions/STIs in pregnancy	`pex_bm_health_preg__chroncond`
Tabulated Data	Health V1-Illness		Illness in pregnancy	`pex_bm_health_preg__illness`
Tabulated Data	Health V1-ER Admissions		ER visit or hospitalization in pregnancy	`pex_bm_health_preg__erhosp`
Tabulated Data	Health V1-Medications		Medications in pregnancy	`pex_bm_health_preg__meds`
Tabulated Data	Health V2-Pregnancy		Health updates up to delivery	`pex_bm_healthv2_preg`
Tabulated Data	Health V2-Infancy		Delivery and birth outcomes	`pex_bm_healthv2_inf`
Mental Health
Tabulated Data	FAM MH		Personal and Family Mental Health	`pex_bm_psych`
Tabulated Data	APA 1/2		Mental Health	`pex_bm_apa`
Tabulated Data	DSM5 Acute Stress or PTSD		PTSD/Acute Stress Symptom Severity	`pex_bm_str__ptsd`
Tabulated Data	EPDS		Postnatal Depression	`pex_bm_epds`
Substance Use
Tabulated Data	ASSIST	V1	SU Before and During Pregnancy	`pex_bm_assistv1`
		V2	SU, Pregnancy End & Postnatal	`pex_bm_assistv2`
		V3	SU After Pregnancy (3 mo anchors)	`pex_bm_assistv3`
Tabulated Data	TLFB		SU Before and During Pregnancy	`pex_ch_tlfb`

	Instrument	Version	Construct	Tabulated Data Table Name
Tabulated Data	BFY		Benefits/Services, Economic Stress	`sed_bm_bfy`
Tabulated Data	HBCD Demographics	V1	Demographics (Adult Visit 1)	`sed_bm_demo`
Tabulated Data	eHITS		Intimate Partner Violence	`sed_bm_ehits`
Tabulated Data	Neighborhood Safety		Neighborhood Safety	`sed_bm_nbhsaf`
Tabulated Data	PACES	<18	Protective Factors	`sed_bm_paces`
Tabulated Data	PROMIS		Perceived Stress/Social Support	`sed_bm_strsup`
Tabulated Data	Unfair Treatment		Experiences of Unfair Treatment	`sed_bm_phx__discr`

Brain Activity & Biosensors🔗

	EEG Task	Tabulated Data Table Name / File-Based Data Folder
Tabulated Data	Auditory Mismatch Negativity (MMN)	`eeg_made_task-MMN_acq-eeg_preprocessingReport` `eeg_qc_task-MMN`
Tabulated Data	Faces (Face)	`eeg_made_task-FACE_acq-eeg_preprocessingReport` `eeg_qc_task-FACE`
Tabulated Data	Video Resting State (RS)	`eeg_made_task-RS_acq-eeg_preprocessingReport` `eeg_qc_task-RS`
Tabulated Data	Visual Evoked Potential (VEP)	`eeg_made_task-VEP_acq-eeg_preprocessingReport` `eeg_qc_task-VEP`
File-Based Data	All Tasks - *Raw BIDS*	rawdata/sub-{ID}/ses-{V0X}/eeg/
File-Based Data	All Tasks - *HBCD-MADE Derivatives*	derivatives/made/

	File-Based Data Raw BIDS	File-Based Data Derivatives [Source Pipeline]	Tabulated Data Tables Derived from Pipeline Derivatives
sMRIStructural MRI	anat/	bibsnet/ [BIBSNet]	`img_bibsnet_space-<T1w\|T2w>_desc-aseg_volumes`
		mriqc/ [MRIQC]	`img_mriqc_<T1w\|T2w>`
		nibabies/ [Infant-fMRIPrep]	None
		xcp_d/ [XCP-D]	`img_xcpd_space-fsLR_seg-<PARC>_stat-mean_desc-curv_morph` `img_xcpd_space-fsLR_seg-<PARC>_stat-mean_desc-sulc_morph` `img_xcpd_space-fsLR_seg-<PARC>_stat-mean_desc-thickness_morph`
		NA - BrainSwipes QC results	`img_brainswipes_xcpd-T2w`
fMRIFunctional MRI	func/	mriqc/ [MRIQC]	`img_mriqc_bold`
		nibabies/ [Infant-fMRIPrep]	None
		xcp_d/ [XCP-D]	`img_xcpd_space-fsLR_seg-<PARC>_stat-alff_bold` `img_xcpd_space-fsLR_seg-<PARC>_stat-coverage_bold` `img_xcpd_space-fsLR_seg-<PARC>_stat-reho_bold`
		NA - BrainSwipes QC results	`img_brainswipes_xcpd-bold`
qMRIQuantitative MRI	anat/	qmri_postproc/ [qMRI Postproc]	None
dMRIDiffusion MRI	dwi/	qsiprep/ [QSIPrep]	`img_qsiprep_space-ACPC_desc-image_qc`
		qsirecon/ [QSIRecon]	None
		qsirecon-DSIStudio/	None
		qsirecon-DIPYDKI/	None
		qsirecon-TORTOISE_model-MAPMRI/	None
		qsirecon-TORTOISE_model-tensor/	None
MRSMR Spectroscopy	mrs/	osprey/ [OSPREY-BIDS]	`img_osprey_<Q>_AlphaCorrWaterScaledGroupNormed_Voxel_1_Basis_1` `img_osprey_<Q>_AlphaCorrWaterScaled_Voxel_1_Basis_1` `img_osprey_<Q>_CSFWaterScaled_Voxel_1_Basis_1` `img_osprey_<Q>_TissCorrWaterScaled_Voxel_1_Basis_1` `img_osprey_<Q>_rawWaterScaled_Voxel_1_Basis_1` `img_osprey_<Q>_amplMets_Voxel_1_Basis_1` `img_osprey_<Q>_tCr_Voxel_1_Basis_1` `img_osprey_HERCULES_qm_processed_spectra` `img_osprey_unedited_qm_processed_spectra`
Label Values Legend <PARC> (parcellations): 4S-<156\|256\|...\|1056>Parcels, Glasser, Gordon, MIDB, MyersLabonte, HCP, Tian (HCP & Tian functional only) <Q> (quantification method): HERCULES_diff1, HERCULES_diff2, HERCULES_sum, unedited_A

Sensor		Data Type	Construct	Tabulated Data Table Name / File-Based Data Folder
Infant Leg Motion	Tabulated Data	Questionnaire 1/2/3	Motor Development, Regulation (Sleep/Wake)	`nt_ch_sens__qtn_<1\|2\|3>`
	File-Based Data	Raw BIDS		rawdata/sub-{ID}/ses-{V0X}/motion/
	File-Based Data	Derivatives		derivatives/hbcd-motion/