Table 1.

Mean optical density (OD) and 95% confidence interval (CI) of the recombinant Pap31-based enzyme-linked immunosorbent assay (ELISA) in relation to immunofluorescent assay (IFA)

IFA	ELISA-OD		P value
	Mean (SD)	95% CI
IFA-IgG
Negative (N = 199)	0.467 (0.26)	0.43–0.50
Positive (N = 103)	1.286 (0.39)	1.21–1.36	< 0.001
IFA-IgM
Negative (N = 268)	0.367 (0.25)	0.36–0.42
Positive (N = 34)	1.100 (0.43)	0.95–1.25	< 0.001