Table 2: Frequencies and adjusted odds ratios (ORs) and 95% confidence intervals (CIs) for chlamydial elementary bodies optical density (OD) units, in cases and controls, categorized by previously defined cut points. (ORs were adjusted for age, education, family history of ovarian cancer, tubal ligation, nulliparity/any parity, and years of oral-contraceptive use).

Chlamydia EB

OD unitsCase subjectsControl subjectsOR (95% CI)

0.10–0.1991381731.1 (0.8–1.5)
0.20–0.399731130.9 (0.6–1.2)
≥0.40621380.6 (0.4–0.9)