Registration is required to download data or to perform on-line bivariate or multivariate analysis. Registration is free. The information you provide as part of the registration process is not shared with any one else. We have made every effort to remove information from the data files that would permit the identification of individual respondents. However, because of the extensive and, in some cases, sensitive content of these data sets, and because we have promised to preserve the confidentiality of our information, we are asking researchers who receive data to agree to specific conditions of use. Failure to abide by the below stated restrictions will result in a prohibition against future receipt of any CDHA data. By completing this registration you are agreeing that: (You must agree to all to have an account created)