Sex difference in the correlation between carotid artery diameter and prevalence of stroke: Insights from a Chinese population.

Background: The atherosclerotic process can cause compensatory enlargement of artery diameter. However, the association between common carotid artery (CCA) diameter and stroke remains unclear.

Methods: This cross-sectional study included 5668 participants ≥40 years of age residing in rural northeast China, in whom the inter-adventitial diameter of CCA was measured. The association between CCA diameter and stroke prevalence was explored using multivariate logistic regression and concentration-response relationship in females and males, respectively.

Results: CCA diameter (mm) was greater in stroke than in non-stroke populations in both males (7.73 versus [vs.] 7.49; P < 0.05) and females (7.69 vs. 7.13; P < 0.001). Among males, when dividing CCA diameters into quartiles, the second quartile (6.86-7.5 mm) had a 1.64 times higher risk for stroke than the bottom quartile (≤6.85 mm) (P < 0.05) in the adjusted model. In females, the top quartile (>7.95 mm) had a 2.08 (1.07-4.04) times higher risk than the bottom quartile (≤6.50 mm) (P < 0.01) (overall trend 1.19 [1.00-1.43]). Moreover, dose-response relationship confirmed correlations between CCA diameter and stroke in females (P < 0.05). The net reclassification index (NRI) and integrated discrimination index (IDI) confirmed the incremental value of CCA diameter in predicting probability of stroke in females (NRI 0.353 [95% confidence interval (CI) 0.198-0.497], P < 0.001; IDI 0.004 [95% CI 0.001-0.006], P < 0.01) and males (NRI 0.201 [95% CI 0.158-0.241], P < 0.001; IDI 0.005 [95% CI 0.001-0.009], P < 0.01).

Conclusions: This study highlighted the incremental value of CCA diameter in optimizing risk classification and stroke prevention in a Chinese population.