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

Table 3

Comparison of control and AAA groups based on IgA antichlamydial antibody titres. 𝜒²=7.89, df = 2, and 𝑃=0.019. The numbers in parenthesis represent percentage.

IgA titre	Control group (𝑛=250)	AAA group (𝑛=249)	OR	95% CI	𝑃 value
EIU <8 (negative)	48 (19.2)	26 (10.4)	1.00	—	—
EIU 8–12 (borderline)	21 (8.4)	27 (10.9)	2.4	1.1–5.4	0.022
EIU >12 (positive)	181 (72.4)	196 (78.7)	2.0	1.2–3.5	0.008

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