The fourth annual curated ABCD Data Release 4.0 is available now on the NIMH Data Archive. In addition to baseline data on the full participant cohort (nearly 12,000 participants), Data Release 4.0 contains early longitudinal data, including 2-year follow-up neuroimaging data (second imaging timepoint), as well as follow-up phenotypic data for the 6-month, 1-year and 18-month visits on the full cohort. Interim data are also available for the 30-month, 3-year and 42-month visits. See table below. Smokescreen genotyping array data with TOPMed imputations are available as well. These include common variations, as well as variations associated with addiction, smoking behavior and nicotine metabolism. Also available are ABCD derived scores from linked external school performance and environmental data, including the Stanford Education Data Archive, EPA Smart Location Database, American Community Survey Area Deprivation Index, FBI’s Uniform Crime Report, lead exposure risk and air pollution indices, among others.
Also included in Data Release 4.0 are COVID supplemental survey data, consisting of survey responses from ABCD families about the impact of the pandemic on their lives. Surveys were sent electronically to all ABCD participants and their parent/guardian in May, June, August, October, and December of 2020, and March and May of 2021. Youth and parents/guardians were asked separately about school attendance and activities, sleep, daily routines, physical activity, mental health, screen time, racism/discrimination in relation to COVID-19, COVID attitudes and practices, and coping behaviors. In addition, when site and school closures began in March 2020, ABCD participants who had their ABCD-assigned activity tracker agreed to extend protocol wear of the device, contributing valuable objective physical activity, resting heart rate, and sleep data. Also included are COVID-19 geocoded metrics that describe the local environment for each participant, including unemployment data, COVID-19 prevalence, and social distancing metrics. Authorized users can obtain more information and access the updated data from https://nda.nih.gov/abcd. Full details are in the Release Notes for Data Release 4.0.
Researchers new to the NIMH Data Archive system interested in gaining access to the data can create an account here and follow the instructions to request access. Returning researchers can log into their account using the Login button.