Table 2. Blink frequency.

Exposure condition	0–20 min	100–120 min
Control (0 ppm)	11.7 (2.4)	10.9 (2.5)
0.05 ppm of acrolein	11.5 (1.5)	10.9 (1.9)
0.1 ppm of acrolein	11.7 (1.7)	12.6 (2.7)*
Ethyl acetate	11.9 (3.5)	11.6 (1.9)
Ethyl acetate + 0.05 ppm of acrolein	11.2 (1.6)	12.5 (3.0)
Ethyl acetate + 0.1 ppm of acrolein	11.7 (1.4)	11.9 (2.4)

Data of 18 volunteers measured in the beginning (0–20 min) and end (100–120 min) of the 2 h exposure. Results (average) were presented in time series as blinks per 20 min with standard deviations in parentheses.

^* p = 0.049 (ANOVA) compared to the first 20 min of exposure.