TABLE 1.

Accuracy and precision of quality controls concentrations calculated by standard curve

Run No.	Sample No.	LLOQ 0.0500 (ng/mg hair)	Low 0.150 (ng/mg hair)	Medium 1.00 (ng/mg hair)	High 14.0 (ng/mg hair)	Run No.	Intraday statistics	LLOQ 0.0500 (ng/mg hair)	Low 0.150 (ng/mg hair)	Medium 1.00 (ng/mg hair)	High 14.0 (ng/mg hair)
	1	0.0470	0.153	1.07	14.3		Mean	0.0471	0.151	1.03	14.0
	2	0.0483	0.149	1.08	14.3		SD	0.0013	0.003	0.04	0.4
1	3	0.0474	0.154	1.02	14.1	1	%CV	2.76	1.99	3.88	2.86
	4	0.0452	0.150	1.03	14.1		%RE	−5.80	+0.667	+3.00	0.00
	5	0.0463	0.147	1.01	13.8		n	6	6	6	6
	6	0.0486	0.152	0.981	13.3
	1	0.0540	0.159	1.04	14.2		Mean	0.0540	0.153	0.990	13.9
	2	0.0563	0.151	0.993	13.4		SD	0.0034	0.003	0.049	0.5
2	3	0.0524	0.149	1.05	14.7	2	%CV	6.30	1.96	4.95	3.60
	4	0.0506	0.153	0.966	13.8		%RE	+8.00	+2.00	−1.00	−0.714
	5	0.0596	0.153	0.972	13.3		n	6	6	6	6
	6	0.0513	0.155	0.921	13.9
	1	0.0432	0.140	0.945	13.0		Mean	0.0427	0.148	1.04	13.9
	2	0.0415	0.142	1.04	13.5		SD	0.0008	0.006	0.06	0.7
3	3	0.0431	0.146	1.02	13.5	3	%CV	1.87	4.05	5.77	5.04
	4	0.0437	0.152	1.11	14.8		%RE	−14.6	−1.33	+4.00	−0.714
	5	0.0420	0.150	1.06	14.5		n	6	6	6	6
	6	0.0428	0.156	1.06	14.3
Interday statistics						Intraday ranges
Theoretical conc.		0.0500	0.150	1.00	14.0
Mean		0.0480	0.151	1.02	13.9		Mean	0.0427–0.0540 0.148–0.153		0.990–1.04	13.9–14.0
SD		0.0052	0.005	0.05	0.5		SD	0.0008–0.0034 0.003–0.006		0.04–0.06	0.4–0.7
%CV		10.8	3.31	4.90	3.60		%CV	1.87–6.30	1.96–4.05	3.88–5.77	2.86–5.04
%RE		−4.00	+0.667	+2.00	−0.714		%RE	−14.6 to +8.00	−1.33 to +2.00	−1.00 to +4.00	−0.714 to 0.00
n		18	18	18	18		n	6	6	6	6