Lifespan Health Research Center

Fels Longitudinal Study Participants

Fels participantsAll testing for the Fels Longitudinal Study is at The Lifespan Health Center, which is located in the Miami Valley Research Park at 3171 Research Blvd., Dayton, OH 45420.

If you are a Fels Study participant and you need to contact us for any reason, please call us at (937) 775-1417 or toll-free at (800) 899-3357, and we will get back to you within 24 hours. You can also e-mail us at If you are a Fels Study participant who has lost contact with us or if you have information about a former participant who is interested in getting back into the study, please call, and we will get back to you within 24 hours.

Testing Schedule for Fels Participants

New Fels Study participants are enrolled into the study at birth and are seen five times during the first year and then twice a year until age 5 and once a year to age 8 years. Starting at age 9 years, Fels children begin visits every six months. This schedule continues until 18 years of age, at which time the half-year visits are dropped and participants come in yearly through age 20. Beginning at age 21 years, adult participants come in every two to five years depending upon where they live. Thank you to all Fels Participants for your dedication and time to this very important study!

Last edited on 03/06/2015.