title: Reporting sexual risk behavior for HIV: a practical risk index and a method for improving risk indices.
abstract: OBJECTIVE
  As a means of enhancing public health efforts to control sexual transmission of human immunodeficiency virus (HIV), methods were developed to report on risk behavior in a manner that is comparable and widely interpretable.
  
  
  METHODS
  An elementary sexual behavior risk index (the vaginal episode equivalent index) that is in accord with some of the essential knowledge about sexual transmission of HIV is described, and a multivariate ordinal risk (MOR) method that can be used to improve such risk indices is introduced.
  
  
  RESULTS
  An example shows that these approaches are applicable to observational studies of seroconversion.
  
  
  CONCLUSIONS
  The MOR represents a powerful new tool to develop valid comparable measures of sexual risk behavior and, thereby, to advance HIV prevention research.
authors.affiliation: Department of Psychiatry, Columbia University, New York, NY 10032, USA.
authors.forename: E
authors.initials: E
authors.lastname: Susser
authors.forename: M
authors.initials: M
authors.lastname: Desvarieux
authors.forename: K M
authors.initials: KM
authors.lastname: Wittkowski
mesh_terms: D005260:Female; D015658:HIV Infections / Q000517:prevention & control* / Q000635:transmission*; D007722:Health Knowledge, Attitudes, Practice; D006305:Health Status Indicators; D006801:Humans; D008297:Male; D015999:Multivariate Analysis; D015203:Reproducibility of Results; D012307:Risk Factors; D012309:Risk-Taking; D012725:Sexual Behavior