Table 2.

Coefficient of Variation Across All Laboratories by Analyte

	Pool A			Pool B			Pool C			Pool D			Pool E
	Mean	N	CV%	Mean	N	CV%	Mean	N	CV%	Mean	N	CV%	Mean	N	CV%
Free Nicotine	48.8	48	57.6	165.4	48	14.4	404.1	48	12.2	779.3	48	11.6	1039.6	48	13.6
Nicotine Glucuronide	10.2	42	38.1	32.7	42	17.6	86.0	42	15.7	158.9	42	20.3	439.5	42	9.4
Total Nicotine	61.2	48	48.7	206	48	15.0	504.7	48	11.6	950.1	48	9.1	1460.3	48	10.9
Free Cotinine	49.4	54	12.6	191.4	54	6.2	475.1	54	5.2	955.3	54	6.8	1782.0	48	6.3
Cotinine Glucuronide	45.2	42	28.7	177.6	42	18.1	443.3	42	14.3	878.7	42	17.9	2220.7	42	18.9
Total Cotinine	93.5	48	19.4	362.4	48	11.0	895.8	48	9.6	1763	48	13.5	3854.2	48	15.6
Free Hydroxycotinine	149.2	42	17.2	559.0	42	8.1	1433	42	7.4	2819	42	6.9	5478.8	42	9.2
Hydroxycotinine Glucuronide	50.4	42	52.0	184.5	42	26.0	463.7	42	28.4	939	42	29.2	1396.4	42	34.1
Total Hydroxycotinine	196.2	48	23.6	736.1	48	10.2	1871	48	10.1	3690	48	10.3	6711.2	48	11.9
Total Nicotine Equivalents	1.9	48	26.2	7.2	48	9.0	17.9	48	7.1	35.1	48	8.6	65.8	48	11.3

Laboratory #11 was omitted