Table 15.

Concordance between ECHA and CATMoS data sets for the categorical end points.

	VT	NT	EPA	GHS
Sn*	0.34	0.98	0.70	0.56
Sp*	1.00	0.86	0.93	0.96
BA	0.67	0.92	0.82	0.76

*Sn and Sp of ECHA calculated based on CATMoS data.

Note: BA, balanced accuracy; CATMoS, Collaborative Acute Toxicity Modeling Suite; ECHA, European Chemicals Agency; EPA, U.S. Environmental Protection Agency; GHS, U.N. Globally Harmonized System of Classification and Labeling of Chemicals; $\mathrm{L}{\mathrm{D}}_{50}$, lethal dose, 50% or dose of a substance that would be expected to kill half the animals in a test group; NT, nontoxic/toxic; Sn, sensitivity or true negative rate; Sp, specificity or true positive rate; VT, very toxic/not very toxic.