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. Author manuscript; available in PMC: 2011 Mar 1.
Published in final edited form as: Alcohol Clin Exp Res. 2009 Dec 17;34(3):488–492. doi: 10.1111/j.1530-0277.2009.01113.x

Table.

Results of ROC Analyses

Case Definition Median grams ethanol in cases (range) [interquartile range] Median grams ethanol in non-cases* (range) [interquartile range] PEth concentration at 95% specificity Sensitivity at 95% specificity Area under the ROC curve (95% CI)
> 1 Drink per Day (n=64) 355 (205-1,378) [250-603] 134 (17-196) [93-152] 45 ng/mL 61 % 0.77 (0.66 to 0.88)
>2 Drinks per Day (n=28) 619 (397-1,378) [520-807] 231 (17-389) [184-310] 127 ng/mL 32% 0.80 (0.70 to 0.90)
*

“Non-cases” included all subjects drinking below the case threshold (e.g., non-cases for the heaviest drinking category included all subjects averaging less than or equal to 2 drinks per day). “Grams ethanol” refers to the 2 weeks preceding blood collection.