Relationship between neighborhood social fragmentation and physical inactivity among adolescents living in Boston, Massachusetts

Roman Pabayo, PhD1, Beth E. Molnar, ScD2, Angie Cradock, ScD3 and Ichiro Kawachi, MD, PhD3, (1)Harvard School of Public Health, Boston, MA, (2)Northeastern University, Boston, MA, (3)Harvard T.H. Chan School of Public Health, Boston, MA