Explore the latest COVID-19 data from NCHS and sign-up to receive e-mail updates. Files include COVID-related content and a longitudinal cohort with data from 2019. Just released: 2017-2019 data tables covering pregnancy, births, marriage, cohabitation, infertility, use of contraception, family life ...Data Access‧Fact Sheets‧NVSS‧Diseases and Conditions‧Researchers‧Data Collection Systems.