Table 3.

Repeatability evaluation

Sample	RSD % a)
	Inter-day precision at the concentration (µg.L− 1) of			Intra-day precision at the concentration (µg.L− 1) of
	2	50	250	2	50	250
EBC	5.8	5.5	5.6	4.2	4.2	3.3
Plasma	6.0	5.8	5.2	4.6	4.5	3.9
Urine	6.1	6.1	5.6	4.2	4.1	3.8

(a) Relative standard deviation