Dataset Information

A Twin Protection Effect? Explaining Twin Survival Advantages with a Two-Process Mortality Model.

ABSTRACT: Twin studies that focus on the correlation in age-at-death between twin pairs have yielded important insights into the heritability and role of genetic factors in determining lifespan, but less attention is paid to the biological and social role of zygosity itself in determining survival across the entire life course. Using data from the Danish Twin Registry and the Human Mortality Database, we show that monozygotic twins have greater cumulative survival proportions at nearly every age compared to dizygotic twins and the Danish general population. We examine this survival advantage by fitting these data with a two-process mortality model that partitions survivorship patterns into extrinsic and intrinsic mortality processes roughly corresponding to acute, environmental and chronic, biological origins. We find intrinsic processes confer a survival advantage at older ages for males, while at younger ages, all monozygotic twins show a health protection effect against extrinsic death akin to a marriage protection effect. While existing research suggests an increasingly important role for genetic factors at very advanced ages, we conclude that the social closeness of monozygotic twins is a plausible driver of the survival advantage at ages <65.

SUBMITTER: Sharrow DJ

PROVIDER: S-EPMC4871430 | biostudies-literature | 2016

REPOSITORIES: biostudies-literature

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Publications

A Twin Protection Effect? Explaining Twin Survival Advantages with a Two-Process Mortality Model.

Sharrow David J DJ Anderson James J JJ

PloS one 20160518 5

Twin studies that focus on the correlation in age-at-death between twin pairs have yielded important insights into the heritability and role of genetic factors in determining lifespan, but less attention is paid to the biological and social role of zygosity itself in determining survival across the entire life course. Using data from the Danish Twin Registry and the Human Mortality Database, we show that monozygotic twins have greater cumulative survival proportions at nearly every age compared ...[more]

PMID: 27192433

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Project description:Rationale: National guidelines have laid out a process to conflict resolution in cases of potentially inappropriate medical interventions. Objectives: To determine the association between information about a process-based approach and lay public perceptions of the appropriateness of withholding medically inappropriate interventions. Methods: Respondents from a nationwide sample completed a survey with two adult intensive care unit-based vignettes: one about advanced cancer where doctors told the family that additional chemotherapy would not be offered, and a second case of multiorgan failure after brain hemorrhage where dialysis would not be offered. Participants were randomly assigned to see or not see information about a detailed process for the determination to withhold (second opinion, ethics consultation, exploring transfer to another institution). The primary outcome was the perceived appropriateness of not providing the treatment (four-point scale, dichotomized for analysis, modified Poisson regression), and the secondary outcome was the negative emotional reaction to the case (positive and negative affect schedule, range 1-5, higher is greater negative emotional response, linear regression). Results: A total of 1,191 respondents were included. Providing detailed process information increased the perceived appropriateness of withholding treatment by approximately 10 percentage points in each vignette: (chemotherapy, 75.7-85.4%; dialysis, 68.0-79.3%). Process information remained associated with perceived appropriateness of withholding treatment after adjustment for order effects and prespecified respondent characteristics (chemotherapy: prevalence ratio, 1.13; 95% confidence interval [CI], 1.07-1.19) (dialysis: prevalence ratio, 1.17; 95% CI, 1.10-1.25). Process information was not associated with emotional response to the cases (chemotherapy: β = -0.04; 95% CI, -0.16 to 0.09) (dialysis: β = -0.02; 95% CI, -0.14 to 0.10; both adjusted for order effects). Conclusions: Providing process-based conflict resolution information increased public acceptance of determinations of medical futility, supporting the practice outlined in national consensus statements.

Dataset Information

A Twin Protection Effect? Explaining Twin Survival Advantages with a Two-Process Mortality Model.

Publications

A Twin Protection Effect? Explaining Twin Survival Advantages with a Two-Process Mortality Model.

Similar Datasets

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