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Count and Percent Identified by Select Cutoffs of PEth. Two trends towards significance were: PEth ≥ 4 ng/ml vs PEth ≥ 8 ng/ml (z = 1.73, p =.081) and PEth ≥ 8 ng/ml vs PEth ≥ 20 ng/ml (z = 1.80, p =.071). No other comparisons were significantly different from one another.
