National Center for Health Statistics

Brian C. Moyer, Ph.D., Director

Amy M. Branum, Ph.D., Associate Director for Science

Division of Health Interview Statistics

Stephen J. Blumberg, Ph.D., Director

Anjel Vahratian, Ph.D., M.P.H., Associate Director for Science

Division of Health and Nutrition Examination Surveys

Alan E. Simon, M.D., Director

Lara J. Akinbami, M.D., Associate Director for Science

For answers to questions about this report or for a list of reports published in these series, contact:

Information Dissemination Staff

National Center for Health Statistics

Centers for Disease Control and Prevention

3311 Toledo Road, Room 4551, MS P08

Hyattsville, MD 20782

Tel: 1–800–CDC–INFO (1–800–232–4636)

TTY: 1–888–232–6348

Internet: https://www.cdc.gov/nchs

Online request form: https://www.cdc.gov/info

For e-mail updates on NCHS publication releases, subscribe online at: https://www.cdc.gov/nchs/updates.