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. Author manuscript; available in PMC: 2014 Dec 1.
Published in final edited form as: J Pharm Biomed Anal. 2013 Aug 23;86:10.1016/j.jpba.2013.08.007. doi: 10.1016/j.jpba.2013.08.007

Table 1.

Inter-day average back-calculated standard concentrations (n = 3)

Nominal, ng/mL 0.50 1.00 2.5 5.0 10.0 25 50 Slope Intercept R
Mean, ng/mL 0.540 1.01 2.34 4.84 10.1 21.9 53.3 0.0397 −0.0007 0.996
SD 0.027 0.01 0.04 0.25 0.4 0.5 0.1 0.0025 0.0028 0.0008
Precision (RSD,%) 5.02 1.09 1.54 5.25 3.96 2.37 0.19 0.08
Accuracy (% dev) 7.9 0.93 −6.40 −3.13 0.63 −12.40 6.60