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This national study used a stratified random sample with 4,700 families (3,600 unwed couples and 1,100 married couples) across 21 cities. Baseline data were obtained from the biological mother and father, with follow-up interviews with both parents when the child was 1, 3, 5 and 9 years old. Data on child health and development were obtained from coded on-site interviews, cognitive assessment tests, as well as a face-to-face interviews. Assessments of child well-being were carried out at 30 and 48 months.
Please see the Princeton University Office of Population Research data archive for more information. Users must register before downloading data (see instructions). Files are packaged in WinZip archives containing SAS, SPSS and Stata data sets. Please visit here for information on downloading, unzipping and using data sets. In order to protect the confidentiality of survey respondents, geographic (i.e., city) identifiers are not released on the public use data files. Medical records data are also not included on the public data files. Researchers can apply for these data sets via restricted use contract.