Table 5.

Statistical scores of the receiver operating characteristic (ROC) analysis performed on dry ground bee pollen dataset (n = 44) in discriminating PAs/PANOs (LOQ- and EFSA-threshold) according to L^∗ and b^∗ (specular component included [SCI] or excluded [SCE]) colour parameters.

	AUC ± SEM	95% CI	Cut-off	Sensitivity	Specificity	P
LOQ-threshold (0.4 μg kg−1)
L∗_SCI	0.74 ± 0.10	0.58–0.86	67.9	0.71	0.80	0.022
b∗_SCI	0.83 ± 0.08	0.69–0.93	39.0	0.91	0.70	<0.001
L∗_SCE	0.75 ± 0.10	0.60–0.87	61.8	0.65	0.90	0.016
b∗_SCE	0.87 ± 0.08	0.74–0.95	49.7	0.91	0.80	<0.001
EFSA-threshold (84 μg kg−1)
L∗_SCI	0.71 ± 0.08	0.55–0.83	67.0	0.71	0.78	0.013
b∗_SCI	0.71 ± 0.08	0.55–0.84	38.1	0.81	0.61	0.007
L∗_SCE	0.71 ± 0.08	0.55–0.84	61.6	0.76	0.74	0.011
b∗_SCE	0.69 ± 0.08	0.53–0.82	49.1	0.86	0.48	0.017

L^∗, lightness; b^∗, yellowness; AUC, area under the curve; CI, confidence interval; SEM, standard error of the mean.