. Author manuscript; available in PMC: 2011 Feb 2.

Published in final edited form as: J Chromatogr B Analyt Technol Biomed Life Sci. 2008 Dec 24;877(3):285–290. doi: 10.1016/j.jchromb.2008.12.024

Table 2.

Inter-day average back-calculated standard concentrations (n = 5)

Theoretic cor ng/ml	Mean ng/ml	SD	Precision (RSD,%)	Accuracy (% dev)
50	54.2	5.0	9.2	8.4
100	98.6	6.5	6.6	-1.4
250	256	17	6.7	2.5
500	503	43	8.5	0.6
750	714	23	3.3	-4.8
1000	956	47	4.9	-4.4
2500	2434	186	7.6	2.6
5000	5032	136	2.7	0.6
10000	10100	255	2.5	1.0
Slope	0.00305	0.00045
Y-intercept	0.00806
R	0.9991	0.00065