. Author manuscript; available in PMC: 2009 Feb 1.

Published in final edited form as: J Chromatogr B Analyt Technol Biomed Life Sci. 2007 Dec 28;862(1-2):213–218. doi: 10.1016/j.jchromb.2007.12.013

Table 1.

Back-calculated concentrations from calibration curves run in duplicate on four occa

Nominal ng/mL)	GM (ng/mL)	SD (ng/mL)	DEV (%)	RSD (%)	n
10	10.7	0.8	7.1%	7.8%	8
25	22.4	1.3	−10.3%	5.7%	8
100	102.3	3.8	2.3%	3.7%	8
500	513.3	17.2	2.7%	3.4%	7
1000	981.8	34.1	−1.8%	3.5%	7
2500	2503.9	78.7	0.2%	3.1%	8

Abbreviations: GM, grand mean; SD, standard deviation; DEV, percent deviation from nominal value; RSD, relative standard deviation; n, total number of replicate observations within the validation runs.