Table 1.

Sensitivity, specificity, positive likelihood ratio (LR+) and negative likelihood ratio (LR-) for the 10-first lactating heifer (FLH) test ($P_{10})$ at an optical density ratio (ODR) positivity threshold (cut-off) between 0.10 and 0.20. AUC = 0.87.

ODR Cut-off	Sensitivity (%)	Specificity (%)	LR+	LR-
0.10	95.8	36.4	1.5	0.1
0.12	91.7	59.1	2.2	0.1
0.14	83.3	68.2	2.6	0.2
0.16	66.7	95.5	14.7	0.3
0.18	45.8	95.5	10.1	0.6
0.20	41.7	95.5	9.2	0.6