Table 3. Comparison of antibody response estimated using the vibriocidal and bioplex assays.

	Fold change–bioplex assay
Fold change–vibriocidal assay	<2	2–3	3–4	4–8	≥8	Total
<2	123	67	18	17	9	234
2–4	100	55	34	41	29	259
4–8	39	43	18	47	16	163
8–32	35	29	28	28	39	159
≥32	26	20	13	30	31	120
Total	323	214	111	163	124	935

χ² value=135.8 (d.f.=16, p<0.0001).

Contingency coefficient=0.356 (p<0.0001).