Table 3.

Precision and accuracy of quality control samples

Analyte	Nominal concentration (ng/mL)	Accuracy (%)			Precision (%CV)
		Day 1	Day 2	Day 3	Day 1	Day 2	Day 3	Inter-day
Equol	50	100.42	90.13	96.60	2.01	4.33	5.11	3.74
	500	103.30	99.85	114.66	2.31	5.61	1.93	2.97
	2,000	97.60	89.90	103.96	6.11	10.61	10.13	8.34
Daidzein	50	99.98	102.73	94.04	4.35	6.44	8.23	6.62
	500	101.48	98.31	97.73	3.14	5.44	7.42	5.38
	2,000	92.50	87.41	86.03	2.88	3.61	3.96	3.58
Dihydrodaidzein	50	103.00	100.15	101.66	3.94	1.43	4.99	3.63
	500	103.79	95.20	106.00	3.96	6.44	3.35	4.34
	2,000	91.70	90.40	96.33	1.68	5.80	6.60	2.82
O-DMA	50	104.00	93.72	96.51	5.16	4.71	5.80	5.32
	500	105.67	93.78	102.33	3.22	9.42	5.54	5.84
	2,000	101.20	93.57	100.93	5.53	5.37	6.53	3.63
Genistein	50	107.66	106.83	99.08	3.97	3.37	6.65	4.86
	500	97.50	88.90	91.36	5.40	3.61	5.60	4.96
	2,000	95.13	92.28	93.38	2.63	3.97	4.17	3.59
Glycitein	50	97.00	80.00	92.13	11.64	7.77	7.52	8.59
	500	100.66	91.96	99.96	6.76	5.09	5.24	5.58
	2,000	96.20	92.70	100.21	2.34	5.87	5.19	4.29
Formononetin	50	95.43	98.65	98.50	4.28	7.69	4.93	5.59
	500	101.53	96.60	108.66	4.95	6.09	2.99	4.35
	2,000	92.72	94.08	101.90	2.09	7.80	2.26	3.78
Coumestrol	50	92.97	89.24	99.42	8.66	9.15	6.69	7.66
	500	93.86	93.95	96.03	9.05	7.78	5.34	7.26
	2,000	100.45	89.95	84.12	7.83	7.34	3.66	6.95
Biochanin A	50	104.23	103.13	107.50	6.82	3.88	3.26	4.48
	500	89.95	94.01	98.41	4.46	6.43	5.24	5.15
	2,000	98.88	95.00	93.68	2.91	3.10	5.47	3.90
Enterodiol	50	93.35	88.63	96.95	9.22	7.46	5.36	7.11
	500	104.95	98.95	112.16	7.81	4.10	4.12	4.98
	2,000	96.50	87.40	94.73	3.98	6.05	7.94	5.86
Enterolactone	50	104.15	102.20	108.83	9.23	5.71	2.50	5.57
	500	103.30	92.26	104.00	5.43	8.33	1.98	5.03
	2,000	84.68	83.33	91.90	1.52	0.35	7.56	3.09