Abstract
Purpose
To study age at death (AD) in elderly men as a function of risk factors and morbid conditions in a 25-year follow-up.
Materials and methods
Men enrolled in the Seven Countries Study belonging to 8 cohorts in 4 European countries (Finland, The Netherlands, Italy and Serbia) were examined between 1984 and 1989 (aged 65–84 years) with measurement of some cardiovascular risk factors and recording of a few major morbid conditions. AD was measured after 25-year follow-up and used in multiple linear regression (MLR) models as dependent variable; while, risk factors and morbid conditions had the role of independent variables.
Results
Out of 2457 men, 2290 died during 25-year follow-up. Overall mean AD was of 82.0 years and slightly different across cohorts, the lowest being recorded in Finland. Age at entry examination and HDL cholesterol were directly associated with AD; while, blood pressure, heart rate, smoking habits and morbid conditions (major cardiovascular diseases, either independently or combined together with diabetes, chronic bronchitis, cancer and silent ECG abnormalities) were inversely related to AD. Body mass index had a parabolic relation with AD with longer survival for levels around 24 units; while, total serum cholesterol was not related to AD. However, only three independent variables were statistically significant when tested in each individual country (age, heart rate and stroke). In a MLR model, where a comorbidity score was entered as independent variable (everything else being equal), the presence of 1 morbid condition was associated with a reduced AD by 1.87 years that increased up to 6.39 years when 4 morbid conditions were present.
Conclusion
AD seems a valuable indicator of all-cause mortality when the study population has reached or approached the extinction.
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Acknowledgements
The authors express their gratitude to Prof Daan Kromhout, University of Groningen, The Netherlands, for allowing the use of the Dutch data of the Seven Countries Study, and to the late Prof Srecko Nedeljkovic, University of Belgrade, Serbia for his high professional and enthusiastic action in collecting data for Serbia.
Funding
The present investigation received no funding. The initial field examination was held only a few months after the Helsinki Declaration and acceptance from the subjects was implied in participation. All methods were carried out in accordance with relevant guidelines and regulations at the time of the study start, although institutional or licensing committees were not still present in the Country and accordingly were not consulted.
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Menotti, A., Puddu, P.E. & Tolonen, H. Age at death in elderly cohorts of four European countries of the Seven Countries Study: the role of comorbidities. Aging Clin Exp Res 33, 521–528 (2021). https://doi.org/10.1007/s40520-020-01568-2
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DOI: https://doi.org/10.1007/s40520-020-01568-2