title: Highly specific photoscreening at the Alaska State Fair. Valid Alaska Blind Child Discovery photography and interpretation.
abstract: During the Alaska State Fair, from 1999 through 2001, experienced MTI photoscreeners from the District 49-A Lions Club screened 1844 children as a part of the Alaska Blind Child Discovery. Physician interpretation produced the following recommendations: normal 93.8%, "normal +" 3.4%, "positive" 2.7% and inconclusive 0.2%. Extrapolating from 53 confirmatory follow-up exams estimates the specificity of this screening (true negatives/all normal follow-up exams) from 97% to 100%, with a positive predictive value (true positive/all positive screenings) greater than 90%. High specificity increases the cost-effectiveness of screening. We derived "ABCD-Specificity" equals true negatives/(exam negatives plus inconclusives). In 2002, an additional 655 children were screened yielding 22 "positive" (3.4%), 28 N+ (4.3%), 605 "normal" (92.4%) and no "inconclusive." This brings the total ABCD State Fair Effort to 2499 screened with 2.8% "positive," 3.6% N+, 93.4% "normal" and only 0.12% "inconclusive."
authors.affiliation: Pediatric Ophthalmology and Strabismus Ophthalmic Associates, 542 West Second Avenue, Anchorage, Alaska 99501-2242, USA. eyedoc@alaska.net
authors.forename: Robert W
authors.initials: RW
authors.lastname: Arnold
mesh_terms: D000413:Alaska; D002648:Child; D002675:Child, Preschool; D005128:Eye Diseases / Q000175:diagnosis*; D006277:Health Fairs; D006801:Humans; D007090:Image Interpretation, Computer-Assisted; D008403:Mass Screening; D010781:Photography; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity