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. Author manuscript; available in PMC: 2009 Oct 1.
Published in final edited form as: Cancer Epidemiol Biomarkers Prev. 2008 Oct;17(10):2594–2602. doi: 10.1158/1055-9965.EPI-08-0278

Table 1.

Precision (percent coefficient of variation) of quality control sample estrogen measurement

Estrogen
metabolite		 0.12 ng
EM/mL		 0.96 ng
EM/mL		 6.4 ng
EM/mL
E3 3.16 0.09 0.47
16-ketoE2 2.18 0.32 0.54
16a-OHE1 2.08 0.44 2.61
16-epiE3 1 0.71 1.02
17-epiE3 1.12 0.68 1.23
3-MeOE1 1.4 0.53 1.82
2-MeOE1 0.46 1.36 0.2
4-MeOE1 0.86 0.13 0.51
2-MeOE2 2.46 1.64 1.35
E1 2.4 0.44 0.55
4-MeOE2 0.67 0.06 0.45
E2 0.87 0.2 0.17
2-OHE1 0.4 0.66 1.72
2-OHE2 1.38 1.4 0.66
4-OHE1 0.88 0.98 0.7

Abbreviation: EM, estrogen metabolite.