This is a self-archived version of an original artcle. This version may difer from the original in paginaton and typographic details. Author(s): Title: Year: Version: Copyright: Rights: Rights url: Please cite the original version: In Copyright http://rightsstatements.org/page/InC/1.0/?language=en Persistence or Change in Leisure-Time Physical Activity Habits and Waist Gain During Early Adulthood: A Twin-Study © 2014 The Obesity Society Accepted version (Final draft) Rottensteiner, Mirva; Pietiläinen, Kirsi H.; Kaprio, Jaakko; Kujala, Urho Rottensteiner, M., Pietiläinen, K. H., Kaprio, J., & Kujala, U. (2014). Persistence or Change in Leisure-Time Physical Activity Habits and Waist Gain During Early Adulthood: A Twin-Study. Obesity, 22 (9), 2061-2070. doi:10.1002/oby.20788 2014