C. trachomatis in Female Reproductive Tract Infections and RFLP-Based Genotyping: A 16-Year Study from a Tertiary Care Hospital

Table 2

Comparison of DFA with tissue culture isolation.

	Tissue culture
DFA	Positive (%)	Negative (%)	Total
Positive	108	167	275 (18.24%)
Negative	90	1142	1232
Total	198 (13.13%)	1309	1507

Characteristics of DFA in relation to tissue culture.
Sensitivity = 54.5% (47.3, 61.6), PPV = 39.2% (33.4, 45.3).
Specificity = 87.2% (85.3, 89.0), NPV = 92.7% (91.1, 94.0).
Agreement = 82.9% (80.0, 84.8).
PPV: positive predictive value, NPV: negative predictive value, DFA: direct immunofluorescence assay.