期刊
AMERICAN JOURNAL OF EPIDEMIOLOGY
卷 187, 期 10, 页码 2186-2191出版社
OXFORD UNIV PRESS INC
DOI: 10.1093/aje/kwy128
关键词
between-within model; generalized survival model; mortality; shared frailty; telomere
资金
- Swedish Research Council [521-2013-8689, 2015-03255]
- Swedish Council for Working Life and Social Research [2013-2292]
- Karolinska Institutet
- Karolinska Institutet Board of Doctoral Education
- Swedish eScience Research Center
- Nordic Information for Action eScience Center
- Loo and Hans Osterman Foundation
- Foundation for Geriatric Diseases
- Magnus Bergwall Foundation
- Strategic Research Program in Epidemiology at Karolinska Institutet
- Swedish Research Council [2015-03255] Funding Source: Swedish Research Council
Although previous studies examining leukocyte telomere length (LTL) and all-cause mortality controlled for several confounders, the observed association could be biased due to unmeasured confounders, including familial factors. We aimed to examine the association of LTL with all-cause mortality in a Swedish twin sample while adjusting for familial factors and allowing for time-dependent effects. A total of 366 participants (174 twin pairs and 18 individuals) were recruited from the Swedish Twin Registry. LTL was assessed using the Southern blot method. All-cause mortality data were obtained through linkage with the Swedish Population Registry, updated through November 15, 2017. To control for familial factors within twin pairs, we applied a between-within shared frailty model based on generalized survival models. Overall, 115 (31.4%) participants were men and 251 (68.6%) were women. The average age of the study participants when blood was drawn was 79.1 years, and follow-up duration ranged from 10 days to 25.7 years (mean = 10.2 years). During the follow-up period, 341 (93.2%) participants died. Shorter LTL was associated with higher mortality rates when controlling for familial factors in the between-within shared frailty model. We found significant time-dependent effects of LTL on all-cause mortality, where the mortality rate ratios were attenuated with increasing age.
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