Group

Time of Exposure (hrs/day)

% Hi

% HbCO

% SHb

1

0

4.07 ± 1.00

0.55 ± 0.07

0.84 ± 0.04bc

2

2

5.22 ± 0.88

0.66 ± 0.04

2.25 ± 0.49a

3

4

4.38 ± 0.57

0.82 ± 0.08ab

2.69 ± 0.22a