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What’s Available?

Questionnaire Data

Many questionnaire variables have been collected at up to four timepoints. Click here to view a summary of all questionnaire data.

  • Baseline questionnaire completed by about 225,000 participants.
  • Almost 1,400 variables describing social and economic demographics, personal and family health histories, medications, sleep patterns, alcohol and tobacco use, physical activity and environmental exposures.
  • Follow-up questionnaire completed in March 2018. It asked participants for an update on their health and additional questions around e-cigarettes and marijuana use, mental health and over-the-counter drugs. Data from the Follow-up Questionnaire are now available.
  • The COVID-19 Questionnaire was completed November 13, 2020. Data from the COVID-19 Questionnaire are now available.
  • The COVID-19 Antibody Study collected questionnaire data and a blood spot sample from participants at up to three timepoints, ending in January 2023. Data from the first and second timepoint are now available.

Read the OHS Cohort Profile Paper in the International Journal of Epidemiology.