Table 3. Participant perceptions of exposure versus true exposure, as assessed by the questionnaire administered during the exposure.

Perceived exposure					% correct
True Exposure	"HIGH"	"MEDIUM"	"NONE"	Total
FA	7	19	34	60	57
100	3	12	6	21	65*
200	11	27	23	61
Total	21	58	63	142	61

N = 42 (one subject’s perception record was missing). * 100 and 200 combined.