Figure 2.
Expected number of stair climbers by gender, number of trains, PODP intervention, and post-PODP. Note that 40 trains/h and 50 trains/h are approximately the observed first and second tertiles, respectively.
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.