cumRR and the 95% confidence interval of AMI admissions among the DM group (red solid line and shaped area) and non-DM group (green dashed line and bars) in subgroups (A) <75 years, (B) ≥75, (C) male, (D) female, (E) first admissions, and (F) readmissions in the cold season (November–April) in public hospitals of Hong Kong SAR in 2002–2011.

AMI, acute myocardial infarction; cumRR, cumulative risk ratio; DM, diabetes mellitus.