Fig. 1.

Participant flow diagram. Participants were included in the intention-to-treat analysis regardless of whether they completed the intervention period. It was found that 17 participants did not meet study eligibility requirements (15 were under 18 y old and 2 were not the intended recipient of the invitation email) and were excluded, yielding a sample of 1,653. The unadjusted model, reported in the SI Appendix, excluded 130 participants who did not have any intervention period trip data, yielding a sample of 1,523. The complete-case primary model reported in the Main Text further excluded 87 who were missing covariate data, yielding a sample of 1,436.