Application of Bayesian networks to generate synthetic health data

J Am Med Inform Assoc. 2021 Mar 18;28(4):801-811. doi: 10.1093/jamia/ocaa303.

Abstract

Objective: This study seeks to develop a fully automated method of generating synthetic data from a real dataset that could be employed by medical organizations to distribute health data to researchers, reducing the need for access to real data. We hypothesize the application of Bayesian networks will improve upon the predominant existing method, medBGAN, in handling the complexity and dimensionality of healthcare data.

Materials and methods: We employed Bayesian networks to learn probabilistic graphical structures and simulated synthetic patient records from the learned structure. We used the University of California Irvine (UCI) heart disease and diabetes datasets as well as the MIMIC-III diagnoses database. We evaluated our method through statistical tests, machine learning tasks, preservation of rare events, disclosure risk, and the ability of a machine learning classifier to discriminate between the real and synthetic data.

Results: Our Bayesian network model outperformed or equaled medBGAN in all key metrics. Notable improvement was achieved in capturing rare variables and preserving association rules.

Discussion: Bayesian networks generated data sufficiently similar to the original data with minimal risk of disclosure, while offering additional transparency, computational efficiency, and capacity to handle more data types in comparison to existing methods. We hope this method will allow healthcare organizations to efficiently disseminate synthetic health data to researchers, enabling them to generate hypotheses and develop analytical tools.

Conclusion: We conclude the application of Bayesian networks is a promising option for generating realistic synthetic health data that preserves the features of the original data without compromising data privacy.

Keywords: Bayesian networks; data dissemination, disclosure risk; health data; synthetic data.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Bayes Theorem*
  • Confidentiality
  • Data Anonymization*
  • Data Management*
  • Datasets as Topic
  • Disclosure
  • Humans
  • Information Dissemination
  • Machine Learning*
  • Neural Networks, Computer*

Associated data

  • Dryad/10.5061/dryad.ttdz08kws