To assess the association of normal systolic blood pressure maintenance (SBP_maintain) with coronary artery calcification (CAC) progression in non-diabetic and diabetic subjects at low to intermediate cardiovascular risk.

Retrospective cohort study with a mean follow-up of 3.3 years.

Data from the Korea Initiatives on Coronary Artery Calcification registry were analysed.

10 754 asymptomatic Korean adults (51.5±8.6 years; 84.5% male; 14.2% diabetes) were enrolled. Participants were divided into two groups: normal SBP_maintain (maintain (≥120 mmHg) at the time of follow-up CAC scan.

CAC progression was defined as a difference of ≥2.5 between the square roots () of the baseline and follow-up coronary artery calcium score (CACS) (transformed CACS). Annualised transformed CACS was defined as transformed CACS divided by the interscan period.

Compared with non-diabetics, the incidence of CAC progression was higher in diabetics (28.4% vs 47.3%, pmaintain was inversely associated with an annualised transformed CACS (β: –0.18, 95% CI: –0.25 to –0.12, pmaintain showed a lower risk of CAC progression than ≥elevated SBP_maintain in non-diabetics; however, this association was not observed in patients with diabetes.

Maintaining normal systolic blood pressure was associated with a significantly attenuated CAC progression, especially in clinical conditions without established diabetes.