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Bayesian network models with decision tree analysis for management of childhood malaria in Malawi

Authors
  • Taneja, Sanya B.1
  • Douglas, Gerald P.2, 3
  • Cooper, Gregory F.1, 2
  • Michaels, Marian G.4
  • Druzdzel, Marek J.5
  • Visweswaran, Shyam1, 2
  • 1 University of Pittsburgh, 5108 Sennott Square, 210 South Bouquet Street, Pittsburgh, PA, 15260, USA , Pittsburgh (United States)
  • 2 University of Pittsburgh, Pittsburgh, PA, USA , Pittsburgh (United States)
  • 3 Global Health Informatics Institute, Area 3, Lilongwe, Malawi , Lilongwe (Malawi)
  • 4 UPMC Children’s Hospital of Pittsburgh, Pittsburgh, PA, USA , Pittsburgh (United States)
  • 5 Bialystok University of Technology, Wiejska 45A, Bialystok, 15-351, Poland , Bialystok (Poland)
Type
Published Article
Journal
BMC Medical Informatics and Decision Making
Publisher
Springer (Biomed Central Ltd.)
Publication Date
May 17, 2021
Volume
21
Issue
1
Identifiers
DOI: 10.1186/s12911-021-01514-w
Source
Springer Nature
Keywords
License
Green

Abstract

BackgroundMalaria is a major cause of death in children under five years old in low- and middle-income countries such as Malawi. Accurate diagnosis and management of malaria can help reduce the global burden of childhood morbidity and mortality. Trained healthcare workers in rural health centers manage malaria with limited supplies of malarial diagnostic tests and drugs for treatment. A clinical decision support system that integrates predictive models to provide an accurate prediction of malaria based on clinical features could aid healthcare workers in the judicious use of testing and treatment. We developed Bayesian network (BN) models to predict the probability of malaria from clinical features and an illustrative decision tree to model the decision to use or not use a malaria rapid diagnostic test (mRDT).MethodsWe developed two BN models to predict malaria from a dataset of outpatient encounters of children in Malawi. The first BN model was created manually with expert knowledge, and the second model was derived using an automated method. The performance of the BN models was compared to other statistical models on a range of performance metrics at multiple thresholds. We developed a decision tree that integrates predictions with the costs of mRDT and a course of recommended treatment.ResultsThe manually created BN model achieved an area under the ROC curve (AUC) equal to 0.60 which was statistically significantly higher than the other models. At the optimal threshold for classification, the manual BN model had sensitivity and specificity of 0.74 and 0.42 respectively, and the automated BN model had sensitivity and specificity of 0.45 and 0.68 respectively. The balanced accuracy values were similar across all the models. Sensitivity analysis of the decision tree showed that for values of probability of malaria below 0.04 and above 0.40, the preferred decision that minimizes expected costs is not to perform mRDT.ConclusionIn resource-constrained settings, judicious use of mRDT is important. Predictive models in combination with decision analysis can provide personalized guidance on when to use mRDT in the management of childhood malaria. BN models can be efficiently derived from data to support clinical decision making.

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