Table 2.

Areas under ROC curve (AUC) for dilution detection of Clonazepam, Ciprofloxacin and Budesonide. Texture parameters were estimated for different regions of the stains: central region (entropy), full stain (entropy), and the central aggregated (area), respectively. The different regions were chosen based on the morphological characteristics of the deposits. Ps = water content (%). Error = standard error. Asym. prob.: asymptotic probability. LCL: the lower confidence limit. UCL: the upper confidence limit.

Clonazepam
	Entropy
P.S. (${\varphi }_s$) %	AUC	Std. Error	Asymptotic Prob	95% LCL	95% UCL
10	0.73016	0.13326	0.06773	0.46897	0.99135
20	0.74107	0.11309	0.06536	0.51941	0.96273
30	0.9881	0.01542	2.47 × 10${}^{-5}$	0.95787	1.01833
40	0.86364	0.07332	0.00217	0.71993	1.00734
50	0.91837	0.04996	1.65 × 10${}^{-4}$	0.82045	1.01628
Ciprofloxacin
	Entropy
P.S.(${\varphi }_s$) %	AUC	Std. Error	Asymptotic Prob	95% LCL	95% UCL
10	0.99111	0.01183	4.58 × 10${}^{-6}$	0.96793	1.0143
20	1	0	7.08 × 10${}^{-6}$	1	1
30	1	0	1.13 × 10${}^{-5}$	1	1
40	1	0	7.08 × 10${}^{-6}$	1	1
50	1	0	2.10 × 10${}^{-6}$	1	1
Budesonide
	Aggregate size
P.S.(${\varphi }_s$) %	AUC	Std. Error	Asymptotic Prob	95% LCL	95% UCL
10	0.72444	0.10247	0.0362	0.5236	0.92529
20	0.77778	0.09272	0.00953	0.59605	0.95951
30	0.95556	0.03616	2.12 × 10${}^{-5}$	0.88469	1.02642
40	1	0	3.07 × 10${}^{-6}$	1	1
50	1	0	3.07 × 10${}^{-6}$	1	1