Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Illustrative example of methods employed to measure built environment characteristics in articles included in this review. A: Administrative boundaries B: Home and school based circular buffers (500 and 1000 m radius respectively) C: Route buffer D: Home based network distance buffer E: Kernel density.
