Chlamydia pneumoniae Antibodies and C-Reactive Protein Levels in Patients with Abdominal Aortic Aneurysms

Table 4

Comparison of control and AAA groups based on IgG antichlamydial antibody titres. 𝜒²=1.62, df = 2, and 𝑃=0.444. The numbers in parenthesis represent percentage.

IgG titre	Control group (𝑛=250)	AAA group (𝑛=249)	OR	95% CI	𝑃 value
EIU <30 (negative)	31 (12.4)	40 (16.1)	1.00	—	—
EIU 30–45 (borderline)	16 (6.4)	18 (7.2)	0.9	0.4–2.2	0.743
EIU >45 (positive)	203 (81.2)	191 (76.7)	0.7	0.4–1.3	0.223

AAA: abdominal aortic aneurysm; IgG: Immunoglobulin G; 𝜒²: chi-square; df: degree of freedom; OR: odds ratio; CI: confidence interval; 𝑛: number; EIU: enzyme immunounit.