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Background: Increasing evidence suggests a continuous relationship between blo od glucose concentrations and cardiovascular risk, even below diagnostic thresho ld levels for diabetes. Objective: To examine the relationship between hemoglobi n A1c, cardiovascular disease, and total mortality. Design: Prospective populati on study. Setting: Norfolk, United Kingdom. Participants: 4662 men and 5570 wome n who were 45 to 79 years of age and were residents of Norfolk. Measurements: He moglobin A1c and cardiovascular disease risk factors were assessed from 1995 to 1997, and cardiovascular disease events and mortality were assessed during the f ollow up period to 2003. Results: In men and women, the relationship between he moglobin A1c and cardiovascular disease (806 events) and between hemoglobin A1c and all cause mortality (521 deaths) was continuous and significant throughout the whole distribution. The relationship was apparent in persons without known d iabetes. Persons with hemoglobin A1c concentrations less than 5%had the lowest rates of cardiovascular disease and mortality. An increase in hemoglobin A1c of 1 percentage point was associated with a relative risk for death from any cause of 1.24 (95%CI, 1.14 to 1.34; P< 0.001) in men and with a relative risk of 1.28 (CI, 1.06 to 1.32; P< 0.001) in women. These relative risks were independent of age, body mass index, waist to hip ratio, systolic blood pressure, serum chol esterol concentration, cigarette smoking, and history of cardiovascular disease. When persons with known diabetes, hemoglobin A1c concentrations of 7%or greate r, or a history of cardiovascular disease were excluded, the result was similar (adjusted relative risk, 1.26 [CI, 1.04 to 1.52]; P=0.02). Fifteen percent (68 o f 521) of the deaths in the sample occurred in persons with diabetes (4%of the sample), but 72%(375 of 521) occurred in persons with HbA1c concentrations betw een 5%and 6.9%. Limitations: Whether HbA1c concentrations and cardiovascular d isease are causally related cannot be concluded from an observational study; int ervention studies are needed to determine whether decreasing HbA1c concentration s would reduce cardiovascular disease. Conclusions: The risk for cardiovascular disease and total mortality associated with hemoglobin A1c concentrations increa sed continuously through the sample distribution. Most of the events in the samp le occurred in persons with moderately elevated HbA1c concentrations. These find ings support the need for randomized trials of interventions to reduce hemoglobi n A1c concentrations in persons without diabetes.
Background: Increasing evidence suggests a continuous relationship between blo od glucose concentrations and cardiovascular risk, even below diagnostic threshol ld levels for diabetes. Objective: To examine the relationship between hemoglobi n A1c, cardiovascular disease, and total mortality. Design: Prospective populati on study Setting: Norfolk, United Kingdom. Participants: 4662 men and 5570 wome n who were 45 to 79 years of age and were residents of Norfolk. Measurements: Hemoglobin A1c and cardiovascular disease risk factors were assessed from 1995 to 1997, and cardiovascular disease events and mortality were assessed during the f ollow up period to 2003. Results: In men and women, the relationship between he moglobin A1c and cardiovascular disease (806 events) and between hemoglobin A1c and all cause mortality (521 deaths) was continuous and significant throughout the whole distribution. The relationship was apparent in persons without known d iabetes. Persons with hemoglobin A1 An increase in hemoglobin A1c of 1 percentage point was associated with a relative risk for death from any cause of 1.24 (95% CI, 1.14 to 1.34; P <0.001; c concentrations less than 5% had the lowest rates of cardiovascular disease and mortality. ) in men and with a relative risk of 1.28 (CI, 1.06 to 1.32; P <0.001) in women. These relative risks were independent of age, body mass index, waist to hip ratio, systolic blood pressure, serum chol esterol concentration, cigarette smoking, and history of cardiovascular disease. When persons with known diabetes, hemoglobin A1c concentrations of 7% or greate r, or a history of cardiovascular disease were excluded, the result was similar (adjusted relative risk, 1.26 [CI, 1.04 to 1.52 Fifteen percent (68 of 521) of the deaths in the sample occurred in persons with diabetes (4% of the sample), but 72% (375 of 521) occurred in persons with HbA1c concentrations betwen 5 % and 6.9%. Limitations: Whether HbA1c concentrations and cardiovascular dcan be be concluded from an observational study; int ervention studies are needed to determine whether decreasing HbA1 concentration s would reduce cardiovascular disease. Conclusions: The risk for cardiovascular disease and total mortality associated with hemoglobin A1c concentrations increa sed continuously through the sample Most of the events in the samp le occurred in persons with moderately elevated HbA1c concentrations. These find for supporting the need for randomized trials of interventions to reduce hemoglobin n A1c concentrations in persons without diabetes.