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Related Concept Videos

Randomized Experiments01:13

Randomized Experiments

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The randomization process involves assigning study participants randomly to experimental or control groups based on their probability of being equally assigned. Randomization is meant to eliminate selection bias and balance known and unknown confounding factors so that the control group is similar to the treatment group as much as possible. A computer program and a random number generator can be used to assign participants to groups in a way that minimizes bias.
Simple randomization
Simple...
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Related Experiment Video

Updated: Nov 4, 2025

Robust Ligature-Induced Model of Murine Periodontitis for the Evaluation of Oral Neutrophils
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Periodontitis and pulmonary function: a Mendelian randomization study.

Sebastian-Edgar Baumeister1, Michael Nolde2,3, Birte Holtfreter4

  • 1Institute of Health Services Research in Dentistry, University of Münster, Albert-Schweitzer-Campus 1 48149, Münster, Germany. sebastian.baumeister@uni-muenster.de.

Clinical Oral Investigations
|May 28, 2021
PubMed
Summary

This study found no causal link between periodontitis and reduced pulmonary function. Genetic liability for periodontitis does not appear to worsen lung function, challenging previous observational findings.

Keywords:
Lung functionMendelian randomizationPeriodontitis

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Area of Science:

  • Genetics
  • Pulmonology
  • Periodontology

Background:

  • Observational studies suggest a link between periodontitis and impaired pulmonary function.
  • However, these studies are limited by confounding factors and reverse causation.
  • Causal inference regarding this association requires robust methodology.

Purpose of the Study:

  • To investigate the causal relationship between genetic predisposition to periodontitis and pulmonary function.
  • To overcome limitations of observational studies using Mendelian randomization.

Main Methods:

  • Utilized Mendelian randomization (MR) analysis.
  • Employed six single-nucleotide polymorphisms (SNPs) for periodontitis from a large genome-wide association study (GWAS).
  • Linked these genetic instruments to lung function data from another substantial GWAS.

Main Results:

  • MR analysis indicated no significant effect of periodontitis liability on forced expiratory volume in one second to forced vital capacity ratio.
  • Sensitivity and replication analyses using different GWAS data confirmed these estimates.
  • No substantial changes in estimates were observed, reinforcing the primary finding.

Conclusions:

  • The findings do not support a causal relationship between genetic predisposition to periodontitis and pulmonary function.
  • Periodontitis is unlikely to be a causal risk factor for the decline of pulmonary function.