Table 6.

The coefficients of variation of positive and negative sera between runs.^a

Number of antisera	Ib (S/P value)	IIb (S/P value)	IIIb (S/P value)	X	SD	CV (%)
1	1.132	0.944	0.852	0.976	0.143	14.63
2	0.910	0.958	0.790	0.886	0.086	9.78
3	0.290	0.254	0.280	0.275	0.019	6.82
4	0.504	0.479	0.398	0.460	0.055	11.97
5	0.522	0.451	0.394	0.455	0.064	14.09
6	0.339	0.299	0.265	0.301	0.037	12.24
7	0.366	0.348	0.284	0.333	0.043	13.02
8	0.491	0.449	0.425	0.455	0.033	7.33
9	0.563	0.479	0.530	0.524	0.042	7.99
10	0.416	0.404	0.531	0.451	0.070	15.53
11	0.072	0.099	0.097	0.089	0.015	16.71
12	0.060	0.055	0.069	0.061	0.007	11.88
13	0.098	0.094	0.084	0.092	0.008	8.31
14	0.088	0.075	0.099	0.088	0.012	14.07
15	0.073	0.059	0.063	0.065	0.007	11.51

^aThe negative–positive cut-off was 0.12.

^bThree repeated experiments with different batches of antigens.