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Nulliparous Pregnancy Outcomes Study Monitoring Mothers-to-be

Dataset introduction

The nuMoM2b dataset posted on the NSRR has gone through various post-processing steps in order to prepare the data for more widespread sharing. Changes and updates to the source data and variable definitions have been coordinated in the numom2b-data-dictionary repository.

Disclaimer: These data are not perfect. Please submit issues for any new problematic findings.


There are two CSV dataset files.

  1. visit1 (Visit 1)
    • Between 6 - 15 weeks of pregnancy
    • 3,012 rows
  2. visit3 (Visit 3)
    • Between 22 - 31 weeks of pregnancy
    • 2,332 rows


The datasets are deidentified. Individual participants are distinguished by the PublicID variable. Only participants who agreed to share their data have been included.

Click here to browse the nuMoM2b dataset variables. Additional data can be downloaded and linked (by PublicID) from NICHD's DASH resource.


Please reach out to us at support@sleepdata.org or in the Forum if you have questions.

National Sleep Research Resource
Nulliparous Pregnancy Outcomes Study Monitoring Mothers-to-be