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Background  It is not clear which glucose measure is more useful in the assessment of atherosclerosis. We investigated the associations of hemoglobin A 1c  (HbA 1c ), glycated albumin (GA), 1,5-anhydroglucitol (1,5-AG), fasting plasma glucose (FPG), and 2-hour postload glucose (PG) with carotid intima-media thickness (IMT) in community-dwelling Japanese subjects.    Methods  A total of 2702 subjects aged 40–79 years underwent a 75-g oral glucose tolerance test and measurements of HbA 1c , GA, 1,5-AG, and carotid IMT by ultrasonography in 2007–2008. Carotid wall thickening was defined as a maximum IMT of >1.0 mm. The crude and multivariable-adjusted linear and logistic regression models were used to analyze cross-sectional associations between levels of glycemic measures and carotid IMT.    Results  The crude average of the maximum IMT increased significantly with rising quartiles of HbA 1c , GA, FPG, and 2-hour PG levels in subjects with and without glucose intolerance (GI), while no clear association was observed for 1,5-AG. After adjustment for other confounding factors, positive trends for HbA 1c , GA, and FPG (all p for trend < 0.05), but not 2-hour PG ( p  = 0.07) remained robust in subjects with GI, but no such associations were found in those without GI. When estimating multivariable-adjusted β values for the associations of 1 SD change in glycemic measures with the maximum IMT in subjects with GI, the magnitude of the influence of HbA 1c  (β = 0.021), GA (β = 0.024), and FPG (β = 0.024) was larger than that of 2-hour PG (β = 0.014) and 1,5-AG (β = 0.003). The multivariable-adjusted odds ratios for the presence of carotid wall thickening increased significantly with elevating HbA 1c , GA, and FPG levels only in subjects with GI (all p for trend < 0.001). Among subjects with GI, the area under the receiver operating characteristic curve significantly increased by adding HbA 1c  ( p  = 0.04) or GA ( p  = 0.04), but not 1,5-AG, FPG, or 2-hour PG, to the model including other cardiovascular risk factors.    Conclusions  In community-dwelling Japanese subjects with GI, elevated HbA 1c , GA, and FPG levels were significantly associated with increased carotid IMT, and HbA 1c  and GA provided superior discrimination for carotid wall thickening compared to 1,5-AG, FPG, and 2-hour PG, suggesting that HbA 1c  and GA are useful for assessing carotid atherosclerosis.    Electronic supplementary material  The online version of this article (doi:10.1186/s12933-015-0247-7) contains supplementary material, which is available to authorized users.

Association of hemoglobin A1c and glycated albumin with carotid atherosclerosis in community-dwelling Japanese subjects: the Hisayama Study