*3.2. Knowledge*

Participants in the Park and Rec group had higher knowledge scores at baseline than the MTurk participants (Figure 1). The scores significantly increased immediately after the training for both groups (post-training). Compared to post-training, the scores significantly decreased at the 3-month follow-up. However, the scores at follow-up were still higher than the baseline scores for both groups. Even though the Park and Rec group started with higher knowledge scores at baseline, the MTurk group

had higher scores post-training and at follow-up. However, the group difference was not significant at baseline and post-training (*p*-value at follow-up: <0.05). The participants in both groups scored the lowest on the questions addressing hazard identification and control selection at each time point. Cronbach's alpha values measured at each time point for internal consistency of the questionnaires were 0.39, 0.55, 0.56 for baseline, post-training and follow-up, respectively.

**Figure 1.** Box and Whisker plot showing change in knowledge score for the groups over time.
