title: Selective screening for chlamydial infection: which criteria to use?
abstract: BACKGROUND
  Screening sexually active women for Chlamydia trachomatis is necessary to detect asymptomatic infections. Selective screening is a common strategy because universal screening is too costly in many settings. In order to guide local programs in the choice of selective screening criteria, we examined the performance of previously proposed screening criteria for C. trachomatis.
  
  
  METHODS
  A clinic-based, cross-sectional study was conducted in public family planning and sexually transmitted disease (STD) clinics in ten counties in North Carolina. Women (n = 4471 in family planning and n = 2201 in STD clinics) undergoing pelvic examination were enrolled consecutively. Nine sets of screening criteria, including age alone, were compared using sensitivity, specificity, number of tests required and receiver-operator characteristic (ROC) analysis. All women underwent testing with ligase chain reaction assay of cervical specimens to identify C trachomatis infection.
  
  
  RESULTS
  The prevalence of C. trachomatis was 7.8% and 11.0% in family planning and STD clinics, respectively. The sensitivities of published criteria ranged from 0.50 to 0.97. Specificities ranged from 0.05 to 0.66. In family planning clinics, the best performing criteria would detect 84% of infections while screening 51% of women. In STD clinics, the same criteria would detect 83% of infections but require testing 67% of women. Testing women aged < or =22 would detect 77% of infections in family planning and 74% of infections in STD clinics, while testing 51% and 48% of the women, respectively.
  
  
  CONCLUSIONS
  When site-specific criteria cannot be developed, age alone is an acceptable strategy for selective screening for chlamydial infection.
authors.affiliation: Department of Medicine School of Medicine, University of North Carolina at Chapel Hill, USA. Bill_Miller@unc.edu
authors.forename: W C
authors.initials: WC
authors.lastname: Miller
authors.forename: I F
authors.initials: IF
authors.lastname: Hoffman
authors.forename: J
authors.initials: J
authors.lastname: Owen-O'Dowd
authors.forename: J T
authors.initials: JT
authors.lastname: McPherson
authors.forename: A
authors.initials: A
authors.lastname: Privette
authors.forename: J L
authors.initials: JL
authors.lastname: Schmitz
authors.forename: G
authors.initials: G
authors.lastname: Woodlief
authors.forename: P A
authors.initials: PA
authors.lastname: Leone
mesh_terms: D000328:Adult; D000554:Ambulatory Care Facilities; D002690:Chlamydia Infections / Q000175:diagnosis* / Q000453:epidemiology; D002692:Chlamydia trachomatis; D003430:Cross-Sectional Studies; D005193:Family Planning Services; D005260:Female; D006801:Humans; D008403:Mass Screening / Q000379:methods*; D009657:North Carolina / Q000453:epidemiology; D015995:Prevalence; D012372:ROC Curve; D012680:Sensitivity and Specificity; D011795:Surveys and Questionnaires