Receiver operating characteristic (ROC) curve analysis demonstrated the accuracy for predicting the presence of IBD with an area under the curve (AUC) of 0.91 (95% CI: 0.86, 0.96) for 1-octene, 0.89 (95% CI: 0.83, 0.95) for 1-decene, and 0.90 (95% CI: 0.84, 0.97) for (E)-2-nonene. A model that combines all three compounds (1-octene, 1-decene, (E)-2-nonene) had a better accuracy for predicting IBD with an AUC of 0.96 (95% CI: 0.93, 0.99).