A) Concentration ratios of AA:DHA, AA:RvD1, and DHA:RvD1 (pM/pM). B) Receiver operating characteristic (ROC) curve of candidate biomarker AA:RvD1 and AA:DHA concentration ratio (pM/pM), as well as the sum of the normalized DHA/AA and RvD1/AA. C) Area under the curve (AUC) of ROC analysis and 95% confidence interval for each candidate biomarker: RvD1, DHA, AA, AA:DHA (pM:pM), DHA:RvD1 (pM/pM), AA:RvD1 (pM/pM), and the sum of the normalized DHA/AA and RvD1/AA