The Nurses’ Health Study and Nurses’ Health Study II are among the largest investigations into the risk factors for major chronic diseases in women.

The success of the studies would not have been possible without our participants, who have made important contributions to scientific knowledge and public health advancements through their participation.

From the original Nurses’ Health Study established in 1976, the studies are now in their third generation with Nurses’ Health Study 3 (learn how to join) and count more than 280,000 participants.