title: Costs and effects of chlamydial screening: dynamic versus static modeling.
abstract: OBJECTIVE
  The objective of this study was to assess the impact of modeling type on the economic evaluation of screening programs for asymptomatic Chlamydia trachomatis infections.
  
  
  METHODS
  We compared a stochastic network simulation model (dynamic model) with a decision analysis model (static model) for estimating the cost-effectiveness of an opportunistic screening program. The influence of the model type on the required data, the computed results, and the sensitivity of model parameters were investigated.
  
  
  RESULTS
  When compared with static modeling, dynamic modeling yielded different cost-effectiveness ratios and identified other optimal screening strategies as it considers changes in the force of infection caused by screening. However, it is more complex, data- and time-demanding, and more sensitive to some parameters affecting the force of infection than static modeling.
  
  
  CONCLUSIONS
  Dynamic models should be applied for the economic evaluation of prevention measures that have the potential to lower the force of infection such as large-scale chlamydial screening programs.
authors.affiliation: Institute of Health Economics and Health Care Management, GSF-National Research Center for Environment and Health, Neuherberg, Germany. robi.welte@gsf.de
authors.forename: Robert
authors.initials: R
authors.lastname: Welte
authors.forename: Maarten
authors.initials: M
authors.lastname: Postma
authors.forename: Reiner
authors.initials: R
authors.lastname: Leidl
authors.forename: Mirjam
authors.initials: M
authors.lastname: Kretzschmar
mesh_terms: D000293:Adolescent; D000328:Adult; D002690:Chlamydia Infections / Q000175:diagnosis* / Q000191:economics* / Q000453:epidemiology / Q000517:prevention & control; D002692:Chlamydia trachomatis; D003362:Cost-Benefit Analysis; D003661:Decision Support Techniques; D005260:Female; D006801:Humans; D008297:Male; D008403:Mass Screening / Q000191:economics / Q000379:methods*; D017059:Models, Econometric; D009426:Netherlands / Q000453:epidemiology; D013269:Stochastic Processes