Table 3. Breath VOCs in IBD: ROC analysis.

VOC	IBD vs. HC	CD vs. UC	IBD vs. OGD
2-Propanol	0.741 (0.639, 0.843)	0.500 (0.302, 0.698)	0.714 (0.506, 0.923)
Acetaldehyde	0.700 (0.591, 0.808)	0.523 (0.301, 0.744)	0.524 (0.233, 0.815)
Acetone	0.644 (0.528, 0.761)	0.629 (0.428, 0.829)	0.557 (0.277, 0.837)
Acetonitrile	0.498 (0.341, 0.655)	0.648 (0.464, 0.831)	0.433 (0.214, 0.653)
Acrylonitrile	0.769 (0.669, 0.868)	0.538 (0.343, 0.733)	0.510 (0.143, 0.876)
Benzene	0.370 (0.252, 0.488)	0.659 (0.456, 0.862)	0.481 (0.180, 0.781)
Carbon disulfide	0.798 (0.703, 0.892)	0.542 (0.341, 0.742)	0.562 (0.374, 0.750)
Dimethyl sulfide	0.733 (0.628, 0.837)	0.473 (0.254, 0.693)	0.633 (0.338, 0.928)
Ethanol	0.809 (0.717, 0.901)	0.470 (0.235, 0.705)	0.700 (0.413, 0.987)
Isoprene	0.681 (0.570, 0.792)	0.625 (0.436, 0.814)	0.462 (0.231, 0.693)
Pentane	0.710 (0.602, 0.818)	0.572 (0.379, 0.765)	0.590 (0.321, 0.860)
1-Decene	0.506 (0.382, 0.629)	0.598 (0.385, 0.812)	0.633 (0.383, 0.884)
1-Heptene	0.654 (0.534, 0.775)	0.610 (0.414, 0.806)	0.524 (0.293, 0.755)
1-Nonene	0.520 (0.397, 0.643)	0.621 (0.405, 0.838)	0.738 (0.506, 0.970)
1-Octene	0.608 (0.489, 0.726)	0.598 (0.395, 0.802)	0.567 (0.294, 0.840)
3-Methylhexane	0.647 (0.533, 0.762)	0.583 (0.390, 0.776)	0.476 (0.212, 0.740)
(E)-2-nonene	0.673 (0.556, 0.790)	0.636 (0.432, 0.841)	0.576 (0.372, 0.780)
Ammonia	0.627 (0.508, 0.746)	0.568 (0.371, 0.765)	0.748 (0.468, 1.000)
Ethane	0.793 (0.689, 0.896)	0.568 (0.369, 0.768)	0.510 (0.238, 0.781)
Hydrogen sulfide	0.616 (0.497, 0.735)	0.549 (0.328, 0.770)	0.619 (0.291, 0.948)
Triethyl amine	0.735 (0.628, 0.842)	0.614 (0.421, 0.807)	0.686 (0.446, 0.926)
Trimethyl amine	0.655 (0.541, 0.769)	0.633 (0.438, 0.827)	0.462 (0.175, 0.749)

Abbreviations: AUC, are under ROC curve; CD, Crohn's disease; CI, confidence interval; HC, non-inflammatory controls; IBD, inflammatory bowel disease; OGD, inflammatory controls; ROC, receiver operating characteristics; UC, ulcerative colitis; VOC, volatile organic compound.

Values presented as AUC (95% CI).