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Cardiovascular autonomic function was based on heart rate variability (HRV) indices from 24-hour ECG recordings and summarized in z-scores for time and frequency domains. Aortic and carotid stiffness were assessed by carotid-femoral pulse wave velocity (PWV) and carotid artery distensibility (CD), respectively. We used multiple linear regression to study the associations and adjusted for demographic and lifestyle factors and a range of cardiovascular risk factors. We tested for effect modification of the associations by glucose metabolism status.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>PWV and CD measures were available in 3673 and 1802 participants, respectively (median (25th; 75th percentile) age: 60 years (53; 66), 51% women, 20% type 2 diabetes by design. Participants with lower HRV had higher aortic stiffness. Per SD lower time-domain and frequency-domain HRV z-scores were associated with 2.8% (95% CI 2.1% to 3.4%) and 2.8% (95% CI 2.1% to 3.5%) higher PWV, respectively. Similar trends were observed for carotid stiffness, with 3.2% (95% CI 1.4% to 5.0%) and 3.1% (95% CI 1.2% to 5.0%) lower CD per SD lower time-domain and frequency-domain HRV, respectively. The magnitude of these associations was higher in groups with prediabetes and type 2 diabetes compared with those with normal glucose metabolism, with evidence of effect modification by glucose metabolism status (p value for interaction: &lt;0.01 for prediabetes and &lt;0.05\u2009to &lt;0.10 for type 2 diabetes, both compared with normal glucose metabolism).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>Cardiovascular autonomic dysfunction is associated with higher aortic and carotid stiffness, especially in people with dysglycemia.<\/jats:p>\n                  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