Table 2.

Distribution of relative peak intensity results (100 at solvent standard) for three versions of the urine treatment.

Relative Peak Intensity1	Method A		Method B		Method C
	No. of Analytes (%)		No. of Analytes (%)		No. of Analytes (%)
	10 ng/mL	250 ng/mL	10 ng/mL	250 ng/mL	10 ng/mL	250 ng/mL
<50	7 (2.7%)	6 (2.3%)	25 (9.6%)	21 (8.1%)	45 (17.3%)	44 (16.9%)
50–80	46 (17.7%)	43 (16.5%)	71 (27.3%)	73 (28.1%)	77 (29.6%)	78 (30.0%)
80–120	189 (72.7%)	194 (74.6%)	150 (57.7%)	157 (60.4%)	123 (47.3%)	126 (48.5%)
120–150	15 (5.8%)	15 (5.8%)	13 (5.0%)	8 (3.1%)	13 (5.0%)	9 (3.5%)
>150	3 (1.2%)	2 (0.8%)	1 (0.4%)	1 (0.4%)	1 (0.4%)	2 (0.8%)
n.d.2	0	0	0	0	1 (0.4%)	1 (0.4%)
Sum	260 (100%)	260 (100%)	260 (100%)	260 (100%)	260 (100%)	260 (100%)

¹$\mathrm{Relative} \mathrm{peak} \mathrm{intensity}=\left(\frac{\mathrm{Peak} \mathrm{area} \mathrm{of} \mathrm{post} \mathrm{spiked} \mathrm{sample}}{\mathrm{Peak} \mathrm{area} \mathrm{of} \mathrm{solvent} \mathrm{standard}}\right)\times 100$ [40]; ² Not determined.