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Excess mortality and cardiovascular disease in young adults with type 1 diabetes in relation to age at onset: a nationwide, register-based cohort study

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Rawshani, Araz, Sattar, Naveed, Franzén, Stefan, Rawshani, Aidin, Hattersley, Andrew T, Svensson, Ann-Marie, Eliasson, Björn, Gudbjörnsdottir, Soffia·2018·The Lancet

Abstract

Background People with type 1 diabetes are at elevated risk of mortality and cardiovascular disease, yet current guidelines do not consider age of onset as an important risk stratifier. We aimed to examine how age at diagnosis of type 1 diabetes relates to excess mortality and cardiovascular risk.Methods We did a nationwide, register-based cohort study of individuals with type 1 diabetes in the Swedish National Diabetes Register and matched controls from the general population. We included patients with at least one registration between Jan 1, 1998, and Dec 31, 2012. Using Cox regression, and with adjustment for diabetes duration, we estimated the excess risk of all-cause mortality, cardiovascular mortality, non-cardiovascular mortality, acute myocardial infarction, stroke, cardiovascular disease (a composite of acute myocardial infarction and stroke), coronary heart disease, heart failure, and atrial fibrillation. Individuals with type 1 diabetes were categorised into five groups, according to age at diagnosis: 0-10 years, 11-15 years, 16-20 years, 21-25 years, and 26-30 years.Findings 27 195 individuals with type 1 diabetes and 135 178 matched controls were selected for this study. 959 individuals with type 1 diabetes and 1501 controls died during follow-up (median follow-up was 10 years). Patients who developed type 1 diabetes at 0-10 years of age had hazard ratios of 4·11 (95% CI 3·24-5·22) for all-cause mortality, 7·38 (3·65-14·94) for cardiovascular mortality, 3·96 (3·06-5·11) for non-cardiovascular mortality, 11·44 (7·95-16·44) for cardiovascular disease, 30·50 (19·98-46·57) for coronary heart disease, 30·95 (17·59-54·45) for acute myocardial infarction, 6·45 (4·04-10·31) for stroke, 12·90 (7·39-22·51) for heart failure, and 1·17 (0·62-2·20) for atrial fibrillation. Corresponding hazard ratios for individuals who developed type 1 diabetes aged 26-30 years were 2·83 (95% CI 2·38-3·37) for all-cause mortality, 3·64 (2·34-5·66) for cardiovascular mortality, 2·78 (2·29-3·38) for non-cardiovascular mortality, 3·85 (3·05-4·87) for cardiovascular disease, 6·08 (4·71-7·84) for coronary heart disease, 5·77 (4·08-8·16) for acute myocardial infarction, 3·22 (2·35-4·42) for stroke, 5·07 (3·55-7·22) for heart failure, and 1·18 (0·79-1·77) for atrial fibrillation; hence the excess risk differed by up to five times across the diagnosis age groups. The highest overall incidence rate, noted for all-cause mortality, was 1·9 (95% CI 1·71-2·11) per 100 000 person-years for people with type 1 diabetes. Development of type 1 diabetes before 10 years of age resulted in a loss of 17·7 life-years (95% CI 14·5-20·4) for women and 14·2 life-years (12·1-18·2) for men.Interpretation Age at onset of type 1 diabetes is an important determinant of survival, as well as all cardiovascular outcomes, with highest excess risk in women. Greater focus on cardioprotection might be warranted in people with early-onset type 1 diabetes.Funding Swedish Heart and Lung Foundation.

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  • The risk of diabetes-related complications remains notably high for all people with type 1 diabetes.

    “The risk of diabetesrelated complications also remains notably high for all people with type 1 diabetes.1,2”

    From The future of type 1 diabetes therapy (2025) · cites this paper as [1]

    The Results (Hazard ratios for mortality and cardiovascular outcomes; page unavailable) report excess risk for eight of nine outcomes among the young adults studied. But the Discussion says absolute risks were low in this cohort. The paper therefore supports elevated relative risks for the outcomes studied, not a notably high risk of all diabetes-related complications for all people with type 1 diabetes. (LLM, conf=0.86)

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  • Life expectancy remains reduced for individuals diagnosed with type 1 diabetes before age 10 years compared with both people diagnosed after 10 years and people without type 1 diabetes.

    “life expectancy remains reduced for individuals diagnosed with type 1 diabetes before age 10 years compared with both people diagnosed after 10 years and people without type 1 diabetes.1,2”

    From The future of type 1 diabetes therapy (2025) · cites this paper as [1]

  • A recent risk tool, developed based on the Scottish/Swedish Diabetes Registry and validated in the Swedish National Diabetes Register, can provide individualized risk predictions.

    “A recent risk tool, developed based on the Scottish/Swedish Diabetes Registry and validated in the Swedish National Diabetes Register can provide individualized risk predictions.793”

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  1. [20]The incidence of diabetes among 0-34 year olds in Sweden: new data and better methods 2014 57 7 1375 81 PMC4052006 24710965

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Authors
Rawshani, A., Sattar, N., Franzén, S., Rawshani, A., Hattersley, A. T., Svensson, A.-M., Eliasson, B., & Gudbjörnsdottir, S.
Affiliations
  • Sahlgrenska University Hospital (SE)
  • University of Glasgow (GB)
  • Region Västra Götaland (SE)
  • University of Exeter (GB)
  • University of Gothenburg (SE)
Corresponding author
  • Rawshani, Araz
  • Sattar, Naveed
Venue
The Lancet
Publisher
Elsevier BV
Published
2018-08
Volume
392
Issue
10146
Pages
477-486
ISSN
  • 0099-5355 (ISSN-L)
  • 0140-6736
OpenAlex
W2887373570
Cited by
802
References
40
Citations by year
2026: 81 · 2025: 103 · 2024: 113 · 2023: 108 · 2022: 101 · 2021: 114 · 2020: 105 · 2019: 67 · 2018: 9
FWCI
58.64
Type
journal article
Language
en
Open access
Locations
  • The Lancet (publishedVersion)
  • PubMed (publishedVersion)
  • Open Research Exeter (University of Exeter) (acceptedVersion, cc-by-nc-nd)
  • PubMed Central (acceptedVersion)
  • ENLIGHTEN (Jurnal Bimbingan dan Konseling Islam) (acceptedVersion, cc-by-sa)
  • Figshare (submittedVersion)
  • Royal Devon and Exeter Research Repository (Royal Devon and Exeter) (submittedVersion)
Funders
Hjärt-Lungfonden
Topics
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes Management and Research
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes, Cardiovascular Risks, and Lipoproteins
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Diabetes and associated disorders
Keywords
type 1 diabetes, age at diagnosis, excess mortality, cardiovascular disease, cardiovascular mortality, coronary artery disease, heart failure, atrial fibrillation, acute myocardial infarction, stroke, young adults, risk stratification, diabetes duration, non-cardiovascular mortality, Swedish National Diabetes Register, sex differences in mortality
MeSH terms
Adolescent, Adult, Age Factors, Cardiovascular Diseases, Child, Child, Preschool, Diabetes Mellitus, Type 1, Female, Humans, Infant, Infant, Newborn, Male, Registries, Sweden, Cohort Studies, Proportional Hazards Models, Age of Onset, Diabetes Complications, Young Adult

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