After adjusting for age, sex, smoking status, drinking status, body mass index, systolic and diastolic blood pressure, heart rate, LDL, HDL, hypertension, and diabetes, plasma FSTL1 levels remained significantly associated with AAA after adjustment (OR 0.94, 95% CI 0.90–0.96, P < 0.001). Here, FSTL1 is linked to diabetes mellitus.