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Recent HbA1c values and mortality risk in type 2 diabetes. population-based case-control study.

ABSTRACT: This study aimed to evaluate mortality within 365 days of HbA1c values of <6.5% or >9.0% in participants with clinical type 2 diabetes mellitus. A matched nested case-control study was implemented, within a cohort of participants with type 2 diabetes from 2000 to 2008. Conditional logistic regression was used to model the odds ratio for mortality adjusting for comorbidity and drug utilisation. There were 97,450 participants with type 2 diabetes; 16,585 cases that died during follow up were matched to 16,585 controls. The most recent HbA1c value was <6.5% (48 mmol/mol) for 22.2% of cases and 24.2% of controls, the HbA1c was >9.0% for 9.0% of cases and 7.7% of controls. In a complete case analysis, the adjusted odds ratio (AOR) for mortality associated with most recent HbA1c <6.5% was 1.31 (95% confidence interval (CI): 1.21,1.42). After multiple imputation of missing HbA1c values the AOR was 1.20 (CI: 1.12,1.28). The complete case analysis gave an AOR for HbA1c >9.0% of 1.51 (CI: 1.33, 1.70), in the multiple imputation analysis this was 1.29 (1.17,1.41). The risk associated with HbA1c <6.5% was age dependent. In the multiple imputation analysis the AOR was 1.53 (CI: 0.84 to 2.79) at age<55 years but 1.04 (CI: 0.92, 1.17) at age 85 years and over. In non-randomised data, values of HbA1c that are either <6.5% or >9.0% may be associated with increased mortality within one year in clinical type 2 diabetes. Relative risks may be higher at younger ages.

SUBMITTER: Nicholas J

PROVIDER: S-EPMC3702542 | biostudies-literature | 2013

REPOSITORIES: biostudies-literature

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Recent HbA1c values and mortality risk in type 2 diabetes. population-based case-control study.

Nicholas Jennifer J Charlton Judith J Dregan Alex A Gulliford Martin C MC

PloS one 20130705 7

This study aimed to evaluate mortality within 365 days of HbA1c values of <6.5% or >9.0% in participants with clinical type 2 diabetes mellitus. A matched nested case-control study was implemented, within a cohort of participants with type 2 diabetes from 2000 to 2008. Conditional logistic regression was used to model the odds ratio for mortality adjusting for comorbidity and drug utilisation. There were 97,450 participants with type 2 diabetes; 16,585 cases that died during follow up were match ...[more]

PMID: 23861845

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Project description:OBJECTIVES:This study aimed to evaluate the effectiveness of multiple risk factor control (MRFC) at reducing mortality and cardiovascular events in diabetes and chronic kidney disease (CKD) in clinical practice. DESIGN:Population-based cohort study. SETTING:Primary care database in the UK, linked with inpatient and mortality data. PARTICIPANTS:Participants aged 40-79 years with type 2 diabetes and valid serum creatinine measurements, including 11?431 participants with CKD (estimated glomerular filtration rate: eGFR 15-59?mL/min/1.73?m2) and 36?429 participants with non-CKD (eGFR ?60?mL/min/1.73?m2). EXPOSURES:MRFC consisted of four components: Haemoglobin A1c (HbA1c) <53?mmol/mol (<7.0%), blood pressure <140/90?mm Hg, total cholesterol <5?mmol/L and no smoking. The main exposure variable was the number of risk factors controlled at baseline. OUTCOME MEASURES:All-cause and cardiovascular mortality in the overall participants. Cardiovascular events, including coronary heart disease and stroke, in participants limited to those without a history of cardiovascular diseases at baseline. RESULTS:In participants with CKD, 37% or 13% met three or four MRFC criteria, respectively. Increasing numbers of risk factors controlled were associated with lower relative hazards for all outcomes studied compared with those meeting no or one criterion. For participants with CKD meeting four criteria, the adjusted HR for all-cause mortality was 0.60 (95% CI 0.53 to 0.69) and the adjusted subdistribution HR for cardiovascular mortality was 0.60 (95% CI 0.50 to 0.70), considering a competing risk of non-cardiovascular death. Participants meeting four criteria also had lower relative hazards for coronary heart disease (adjusted subdistribution HR 0.73, 95%?CI 0.59 to 0.91) and stroke (0.63, 95% CI 0.45 to 0.89), considering death as a competing risk. CONCLUSIONS:MRFC may lower the increased risks for mortality and cardiovascular events in people with diabetes and CKD. Further research is needed to evaluate appropriateness of MRFC according to individual participants' health status for improved management of cardiovascular risks in this population.

Dataset Information

Recent HbA1c values and mortality risk in type 2 diabetes. population-based case-control study.

Publications

Recent HbA1c values and mortality risk in type 2 diabetes. population-based case-control study.

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