Table 3.

Change in cognitive function with age and exposure status.

Cognitive variable	Age—t value	Age—p value	Status—t value	Status—p value
Trails making Test A	-8.536	<0.001	1.026	0.307
Trails making Test B	-9.660	<0.001	2.507	0.013
Digit backward span	4.691	<0.001	-2.031	0.044
Digit forward span	3.513	0.001	-3.308	0.001
California verbal learning Test-C	4.053	<0.001	-4.600	<0.001

Subject was the random variable.

Significant p values at <0.05 have been presented in bold font.