Table 3.

Associations between log-transformed Stroop and ADD response times and PM_2.5 using a piecewise linear regression with a breakpoint at the NAAQS PM_2.5 primary annual average standard with a level of 12.0 μg/m³. Results show the percent change in the geometric mean of each test outcome for an IQR increase in PM_2.5 (IQR =8.8 g/m³).

	Stroop test			ADD test
	% change per IQR increase (95%CI)			% change per IQR increase (95%CI)
PM2.5 level	Response time	Interference time	Throughput	Response time	Throughput
PM2.5<12 μg/m3	0 (−1.88, 0.36)	3.88 (−9.77, 16.08 )	−0.1 (−2.14, 1.94 )	0.59 (−2.85, 4.04 )	−0.97 (−3.86, 2.00 )
PM2.5 ≥12μg/m3	0.73 (0.33, 1.13)***	5.76 (1.89, 11.20 )**	−0.77 (−1.47, −0.08 )*	0.9 (−0.15, 1.95 )	−1.5 (−2.59, −0.33 )*

^*=p<0.05

^**=p <0.01

^***=p< 0.001