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A Percent reduction was calculated as follows: [(Without LEV – with LEV) / Without LEV] × 100.
A Adjusted Concentration = Measured Concentration–Average Background Concentration. If Average Background Concentration exceeds the Measured Concentration, the Adjusted Concentration value is considered to be zero when calculating percent reduction.
B Percent reduction was calculated as follows: [(Adjusted Without LEV–Adjusted With LEV)/Adjusted Without LEV] × 100.
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