This portal provides a single source for National Institute on Drug Abuse (NIDA) Clinical Trials Network (CTN)-recommended Common Data Elements (CDEs) of Substance Use Disorders for use in clinical trials and electronic health records (EHRs).

A data element describes the (data base) characteristics for a discrete piece of data that will be collected, stored or exchanged during the course of a study or a health examination, but does not include the collected data. A common data element is one that can be commonly applied to multiple data sets across different studies or institutions, such that its intentional commonality can improve data quality and promote data sharing.

The National Institutes of Health (NIH) encourages the development and use of common data elements for clinical research, patient registries, and other human subject research in order to improve data quality and opportunities for comparison and combination of data from multiple studies and with electronic health records.

All the CDEs displayed on this NIDA CTN CDE website are created and housed in the National Cancer Institute (NCI) cancer Data Standards Repository (caDSR) (https://cdebrowser.nci.nih.gov/CDEBrowser/). The caDSR is a repository of data elements and case report forms that assists investigators in identifying and selecting data elements for use in their projects, with contributions from 7 NIH agencies and other collaborating institutions. All CDEs are created according to guidelines from the ISO/IEC 11179 Metadata Registry standard.

For ease of use and understanding, the CDEs on this portal are organized into data collection instruments that are familiar to work in clinical studies and health records. Each instrument contains a group of CDEs related by the topic for data collection, but individual CDEs also can be selected independently, although usage of CDEs separate from a complete instrument may require validation.