Table 1. Summary of urinary NEO (ng/mg Cr) results.

TreatmentGroup	Treatment	Values as %of control(mean ± s.e.m.)	Friedman test		Wilcoxon test		Spearmancorrelationagainst control
			χ2	P	T+	P	rs	P
Collection and medium-term storage	Contamination with soil	96.1 ± 3.6			18	0.206	0.965	<0.0001
	Contamination with faeces	98.3 ± 4.2			18	0.204	0.932	<0.0001
	Collection onto filter paper	110.4 ± 4.1			64	0.052	0.951	<0.0001
	21 days storage at RT without preservative	157.1 ± 9.3	27.839	<0.001			0.891	<0.001
	21 days storage at RT with ProClin 200	103.0 ± 4.6	1.403	0.705			0.964	<0.0001
Processing and long-term storage	2 months storage at RT with ProClin 200	114.3 ± 3.4			78	<0.001	0.965	<0.0001
	4 months storage at RT with ProClin 200	129.7 ± 3.6			78	<0.001	0.923	<0.0001
	Lyophilisation	100.6 ± 2.0			44	0.718	0.993	<0.0001
	8-months storage in freezer	105.4 ± 3.9			27	1.000	0.974	<0.0001
	Three 24-hour freeze-thaw cycles	101.6 ± 4.1	8.667	0.013			0.986	<0.0001

RT = ambient temperature (22−23 °C); values in bold indicate statistical significance.