Table 2. Additional performance metrics for the top three teams in sub-challenge 2 of the sbv IMPROVER Systems Toxicology Challenge.

The metrics were computed using a cut-off of 0.5 on the confidence values that a sample was taken from a current smoker (left) or former smoker (right). For the former smoker vs never-smoker comparison (right) performance metrics were obtained from all samples and hence correspond to values in parentheses in Table 1.

	Smoker vs Non-Current Smoker			Former Smoker vs Never-smoker
Team	Sensitivity (%)	Specificity (%)	Balanced accuracy (%)	Sensitivity (%)	Specificity (%)	Balanced accuracy (%)
219	85	93	89	74	39	56
250	90	79	84	59	46	53
264	74	85	80	85	32	59