Table 5.

Relative potencies of samples A, B and C.

	B relative to A			C relative to A			C relative to B (coded duplicates)
Lab	GM	GCV	n	GM	GCV	n	GM	GCV	n
1	0.99	8.1	9	0.98	16.7	9	0.99	14.7	9
2	1.08	11.7	11	1.07	14.9	11	1.00	10.8	11
3	0.97	8.6	9	1.10	24.1	9	1.14	16.5	9
4	0.97	8.6	12	0.97	7.3	12	1.00	8.2	12
5	0.97	6.1	9	0.99	7.4	9	1.03	5.5	9
6	0.96	13.6	20	1.00	14.5	20	1.01	12.9	12
7	0.99	25.4	8	1.08	28.7	7	1.14	38.6	9
8	0.92	31.8	8	0.86	21.8	8	1.09	11.9	8
9	0.99	26.9	6	1.07	17.9	6	0.96	35.8	4
10	0.98	8.6	9	0.94	12.7	9	0.96	11.0	9
11	1.00	9.9	11	0.99	12.1	12	0.99	12.3	11
12	1.00	11.1	8	1.00	8.7	8	1.04	8.7	9
13	0.92	16.0	18	0.96	8.7	18	1.05	12.8	18
14	1.06	13.4	9	1.10	8.0	9	1.04	17.0	9
15	0.89	5.6	9	0.96	3.2	9	1.08	4.2	9
16	1.24	55.4	3	1.17	13.3	3	0.94	39.5	3
18	0.95	22.6	9	0.96	14.0	7	1.05	15.9	8
19	0.90	37.8	9	1.07	42.4	5	1.04	48.8	6
20	0.87	27.0	12	0.95	22.8	11	1.08	27.4	12
21	0.97	28.4	6	0.98	16.9	5	0.94	20.4	4
22	1.33	33.3	3	1.27	23.2	2	1.16	.	1
23	1.03	9.4	5	1.00	6.7	6	1.00	11.2	8
24	0.99	30.9	7	1.08	14.8	9	1.09	26.7	7
GM (95% CI)	0.99 (0.95–1.04)			1.02 (0.99–1.06)
Between-lab
GCV	10.1			8.7
GMa	0.97			1.01
GMb (95% CI)	0.97 (0.94–1.00)			1.01 (0.98–1.04)
Between-lab
GCVb	5.7			5.7
GMab	0.96			1.00

GM — geometric mean.

CI — confidence interval.

GCV — geometric coefficient of variation (%).

n — number of estimates used in calculation.

^aCalculated as geometric mean of all individual assay estimates.

^bExcludes laboratories 2, 5, 7, 8, 16, 18, 21 and 22.