Table 5.

The coefficients of variation of positive sera within the same run.^a

Number of antisera	Ib (S/P value)	IIb (S/P value)	IIIb (S/P value)	X	SD	CV (%)
1	0.944	1.181	0.970	1.032	0.130	12.62
2	0.624	0.766	0.668	0.686	0.073	10.62
3	0.254	0.320	0.307	0.294	0.035	11.93
4	0.479	0.523	0.562	0.521	0.041	7.94
5	0.451	0.472	0.507	0.477	0.028	5.91
6	0.299	0.328	0.371	0.333	0.036	10.86
7	0.398	0.364	0.424	0.395	0.030	7.14
8	0.449	0.506	0.396	0.451	0.055	12.22
9	0.479	0.438	0.396	0.438	0.042	9.51
10	0.404	0.427	0.404	0.412	0.013	3.27
11	0.099	0.085	0.098	0.094	0.008	8.70
12	0.052	0.048	0.042	0.047	0.005	1 0.91
13	0.094	0.077	0.082	0.084	0.009	10.83
14	0.049	0.050	0.052	0.050	0.002	2.99
15	0.051	0.044	0.044	0.046	0.004	8.84

^aThe negative–positive cut-off was 0.12.

^bThree repeated experiments with different batches of antigens.