Poisson regression.

Koletsi D London School of Hygiene and Tropical Medicine, University of London, London, United Kingdom; private practice, Athens, Greece.
Pandis N Department of Orthodontics and Dentofacial Orthopedics, School of Dental Medicine/Medical Faculty, University of Bern, Bern, Switzerland; private practice, Corfu, Greece.

Published in:

American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics. - 2017