TABLE 3.

Precision results of IgG anti-PT ELISA^a

Parameter	%CV for sample (geometric mean concn [EU/ml])
	S1 (49)	S2 (58)	S3 (83)	S4 (100)	S5 (135)	S6 (204)	S7 (217)
Intra-assay precision
Analyst 1	22	25	18	15	24	15	21
Analyst 2	16	12	8	10	13	15	13
Analyst 3	12	10	15	10	14	14	13
Analyst 4	12	12	11	12	14	12	14
Analyst 5	16	16	18	21	17	19	18
Analyst 6	17	14	13	13	16	12	27
Interassay precision
Site A	22	23	22	24	23	23	26
Site B	21	29	23	21	25	21	26
Site Bb	16	17	15	16	18	19	22
Reproducibility
Site-to-site	23	28	23	23	27	25	29
Site-to-sitec	20	22	20	21	23	23	27

^aSamples are ordered from low to high concentrations. Boldface (samples 2 to 5) indicates those samples with an IgG anti-PT concentration in the range analyzed under the prespecified acceptance criteria (50 to 200 EU/ml).

^bInterassay precision without analyst 1 from site B.

^cReproducibility without analyst 1 from site B.