The CHAT dataset posted on the NSRR has gone through various post-processing steps in order to prepare the data for more widespread sharing. The source data are from the CHAT Data Coordinating Center at the University of Pennsylvania. Changes and updates to the source data and have been coordinated in the chat-data-dictionary repository.
The dataset is broken down into
followup files, each of which contain 453 rows. Participants who withdrew or did not complete the protocol will have a greater prevalence of missing data in the
followup file. Use nsrrid, the CHAT subject identifier, to link datasets with raw polysomnography data.
Note: EDF/XML files are available for
nonrandomized CHAT subjects (i.e. those who did not meet all eligibility criteria to be randomized). Covariate data for the
nonrandomized group are also available.
The forms are included here for historical purposes only and are not intended for use in prospective studies. If you wish to use these forms, please check existing copyrights and regulations beforehand.