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Predictors of all-cause mortality among 514,866 participants from the Korean National Health Screening Cohort

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  • Choonghyun Ahn
  • Yunji Hwang
  • Sue K Park

Abstract

Background: There is not enough evidence regarding how information obtained from general health check-ups can predict individual mortality based on long-term follow-ups and large sample sizes. This study evaluated the applicability of various health information and measurements, consisting of self-reported data, anthropometric measurements and laboratory test results, in predicting individual mortality. Methods: The National Health Screening Cohort included 514,866 participants (aged 40–79 years) who were randomly selected from the overall database of the national health screening program in 2002–2003. Death was determined from causes of death statistics provided by Statistics Korea. We assessed variables that were collected at baseline and repeatedly measured for two consecutive years using traditional and time-variant Cox proportional hazards models in addition to random forest and boosting algorithms to identify predictors of 10-year all-cause mortality. Participants’ age at enrollment, lifestyle factors, anthropometric measurements and laboratory test results were included in the prediction models. We used c-statistics to assess the discriminatory ability of the models, their external validity and the ratio of expected to observed numbers to evaluate model calibration. Eligibility of Medicaid and household income levels were used as inequality indexes. Results: After the follow-up by 2013, 38,031 deaths were identified. The risk score based on the selected health information and measurements achieved a higher discriminatory ability for mortality prediction (c-statistics = 0.832, 0.841, 0.893, and 0.712 for Cox model, time-variant Cox model, random forest and boosting, respectively) than that of the previous studies. The results were externally validated using the community-based cohort data (c-statistics = 0.814). Conclusions: Individuals’ health information and measurements based on health screening can provide early indicators of their 10-year death risk, which can be useful for health monitoring and related policy decisions.

Suggested Citation

  • Choonghyun Ahn & Yunji Hwang & Sue K Park, 2017. "Predictors of all-cause mortality among 514,866 participants from the Korean National Health Screening Cohort," PLOS ONE, Public Library of Science, vol. 12(9), pages 1-14, September.
    • Handle: RePEc:plo:pone00:0185458
    DOI: 10.1371/journal.pone.0185458
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    References listed on IDEAS

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    1. Central Bureau for Health Intelligence (CBHI), 2015. "The National Health Profile 2015," Working Papers id:7552, eSocialSciences.
    2. van Buuren, Stef & Groothuis-Oudshoorn, Karin, 2011. "mice: Multivariate Imputation by Chained Equations in R," Journal of Statistical Software, Foundation for Open Access Statistics, vol. 45(i03).
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