Table 4.

Potencies of samples A, B and C relative to IS 09/136.

Lab	Sample A			Sample B			Sample C
	GM	GCV	n	GM	GCV	n	GM	GCV	n
1	0.24	10.0	8	0.23	5.0	7	0.23	17.4	8
2	0.66	14.3	12	0.71	15.9	11	0.71	10.4	12
3	0.55	21.7	9	0.53	16.3	9	0.61	13.7	9
4	0.33	8.0	12	0.32	9.9	12	0.32	8.4	16
5	1.00	14.4	6	0.96	10.4	6	0.95	7.0	4
6	0.39	13.2	14	0.36	17.8	14	0.38	17.5	15
7	0.85	22.9	7	0.90	22.9	4	0.95	.	2
8	1.39	19.4	8	1.28	9.1	6	1.27	20.9	8
9	0.38	27.5	5	0.31	27.0	3	0.39	20.4	6
10	0.26	14.0	8	0.25	9.8	9	0.24	13.6	8
11	0.36	14.4	11	0.34	18.6	11	0.35	11.9	11
12	0.40	10.5	4	0.38	7.8	6	0.38	12.8	9
13	0.27	11.2	17	0.25	17.2	16	0.26	13.1	17
14	0.37	16.6	9	0.40	21.9	8	0.39	13.8	11
15	0.24	7.3	9	0.22	9.6	9	0.23	7.9	12
16	0.36	40.9	3	0.45	36.0	3	0.36	44.5	4
18	1.09	25.2	8	1.02	37.8	8	1.00	33.8	8
19	0.41	12.3	6	0.34	35.4	7	0.29	3.0	3
20	0.30	18.7	8	0.26	23.9	9	0.28	23.3	9
21	1.08	63.4	4	1.30	67.6	5	1.40	44.3	8
22	1.33	.	1	2.15	.	1	1.44	.	1
23	0.35	44.6	7	0.26	24.9	5	0.36	46.3	6
24	0.58	19.0	8	0.61	18.9	6	0.59	15.5	6
GM (95% CI)	0.49 (0.38–0.62)			0.48 (0.36–0.63)			0.48 (0.37–0.63)
Between-lab GCV	76.0			92.6			83.3
GMa	0.44			0.42			0.43
GMb (95% CI)	0.35 (0.30–0.40)			0.32 (0.27–0.38)			0.34 (0.29–0.40)
Between-lab GCVb	30.2			34.8			34.8
GMa,b	0.34			0.32			0.33

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.