Table 6 Results of external validation experiments providing a comparison of the efficiency of the various evaluated diversity and inequality metrics in predicting a preterm delivery outcome.

	TCS	Shannon	Simpson	Chao1	Gini	Ricci-Schutz	Atkinson	Theil	Decile ratio (90:10)
Accuracy	0.924	0.784	0.880	0.897	0.947	0.940	0.937	0.940	0.924
Sensitivity	0.667	0.500	0.111	0.778	0.556	0.556	0.611	0.611	0.167
Specificity	0.940	0.802	0.929	0.905	0.972	0.965	0.958	0.961	0.972
PPV	0.414	0.138	0.091	0.341	0.556	0.500	0.478	0.500	0.273
NPV	0.978	0.962	0.943	0.985	0.972	0.972	0.975	0.975	0.948
MCC	0.487	0.174	0.037	0.472	0.527	0.495	0.508	0.521	0.175

These experiments were performed using vaginal microbiome samples obtained before 20 weeks of gestation (from studies 2, 3, and 4).

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