Table 2.

Experiment groups.

Group	Design	First trial	Second trial
1	Standard	Office, cafeteria	School, hallway
2		School, hallway	Office, cafeteria
3		Office, hallway	School, cafeteria
4		School, cafeteria	Office, hallway
5	Enhanced	Office, cafeteria	School, hallway
6		School, hallway	Office, cafeteria
7		Office, hallway	School, cafeteria
8		School, cafeteria	Office, hallway