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Association between Systemic Immunity-Inflammation Index and Hyperlipidemia: A Population-Based Study from the NHANES

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Summary
This summary is machine-generated.

The systemic immunity-inflammation index (SII) is positively associated with hyperlipidemia in US adults. This novel inflammatory marker may play a role in lipid level dysregulation, warranting further investigation.

Keywords:
NHANEScross-sectional studyhyperlipidemiasystemic immunity-inflammation index

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Area of Science:

  • Clinical Medicine
  • Biochemistry
  • Public Health

Background:

  • Aberrant blood lipid levels are associated with systemic inflammation.
  • The systemic immunity-inflammation index (SII) is a novel marker reflecting immune and inflammatory status.
  • Understanding the relationship between SII and hyperlipidemia is crucial for cardiovascular health.

Purpose of the Study:

  • To investigate the probable link between the systemic immunity-inflammation index (SII) and hyperlipidemia.
  • To describe the nonlinear association and potential threshold effects between SII and hyperlipidemia.

Main Methods:

  • Cross-sectional study using data from 6117 US adults (2015-2020 NHANES).
  • SII calculated as (platelet count × neutrophil count)/lymphocyte count.
  • Hyperlipidemia defined by National Cholesterol Education Program standards.
  • Nonlinear associations analyzed using smoothing curves and two-segment linear regression.

Main Results:

  • A substantial positive correlation was found between SII and hyperlipidemia [1.03 (1.01, 1.05)] in multivariate analysis.
  • The association remained significant across subgroups (age, sex, BMI, smoking, hypertension, diabetes).
  • A nonlinear association with an inflection point of 479.15 was identified.

Conclusions:

  • The systemic immunity-inflammation index (SII) is significantly associated with hyperlipidemia in US adults.
  • This suggests SII may be a relevant marker in the context of lipid dysregulation.
  • Further large-scale prospective studies are needed to elucidate the role of SII in hyperlipidemia.