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Limitations of using COX proportional hazards model in cardiovascular research

Nan Jiang1, Yongfa Wu1, Chengjia Li2

  • 1Geriatric Psychiatry, Second People's Hospital of Zhoushan, Zhoushan, 316000, China.

Cardiovascular Diabetology
|June 26, 2024
PubMed

Insights

The Triglyceride-Glucose (TyG) index is linked to increased chest pain and mortality risk. However, the study

Area of Science:

  • Cardiovascular Medicine
  • Metabolic Syndrome Research
  • Epidemiology

Background:

  • The Triglyceride-Glucose (TyG) index, a marker of insulin resistance, is increasingly studied for its association with cardiovascular diseases.
  • Previous research suggests a link between the TyG index and adverse cardiovascular outcomes, but limitations in analytical methods persist.

Discussion:

  • The COX proportional hazards model, used by Zhao et al., assumes constant hazard ratios, which may not accurately reflect the dynamic relationship between the TyG index and outcomes over time.
  • Potential issues include biased estimates due to violated assumptions, challenges with time-dependent covariates, and the possibility of residual confounding.
  • Subgroup analyses may lack statistical power, and interactions with other metabolic markers were not investigated.

Key Insights:

  • A positive correlation exists between the TyG index and chest pain incidence in the U.S. population.
  • A nonlinear relationship was observed between the TyG index and mortality.
  • The study highlights the need for more robust analytical methods to assess these associations.

Outlook:

  • Future research should employ advanced statistical models, such as time-varying covariate models, to better capture the temporal dynamics of the TyG index's impact on cardiovascular events.
  • Further investigation into interactions between the TyG index and other metabolic factors is warranted.
  • Refined analytical approaches will enhance understanding of the TyG index's role in cardiovascular risk stratification.

Keywords:
COX modelRight-censoredTriglyceride-glucose index

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