title: Detection of pelvic inflammatory disease: development of an automated case-finding algorithm using administrative data.
abstract: ICD-9 codes are conventionally used to identify pelvic inflammatory disease (PID) from administrative data for surveillance purposes. This approach may include non-PID cases. To refine PID case identification among women with ICD-9 codes suggestive of PID, a case-finding algorithm was developed using additional variables. Potential PID cases were identified among women aged 15-44 years at Group Health (GH) and Kaiser Permanente Colorado (KPCO) and verified by medical record review. A classification and regression tree analysis was used to develop the algorithm at GH; validation occurred at KPCO. The positive predictive value (PPV) for using ICD-9 codes alone to identify clinical PID cases was 79%. The algorithm identified PID appropriate treatment and age 15-25 years as predictors. Algorithm sensitivity (GH = 96.4%; KPCO = 90.3%) and PPV (GH = 86.9%; KPCO = 84.5%) were high, but specificity was poor (GH = 45.9%; KPCO = 37.0%). In GH, the algorithm offered a practical alternative to medical record review to further improve PID case identification.
authors.affiliation: Division of STD Prevention, Centers for Disease Control and Prevention, 1600 Clifton Road, Mailstop E-02, Atlanta, GA 30333, USA. col8@cdc.gov
authors.forename: Catherine L
authors.initials: CL
authors.lastname: Satterwhite
authors.forename: Onchee
authors.initials: O
authors.lastname: Yu
authors.forename: Marsha A
authors.initials: MA
authors.lastname: Raebel
authors.forename: Stuart
authors.initials: S
authors.lastname: Berman
authors.forename: Penelope P
authors.initials: PP
authors.lastname: Howards
authors.forename: Hillard
authors.initials: H
authors.lastname: Weinstock
authors.forename: David
authors.initials: D
authors.lastname: Kleinbaum
authors.forename: Delia
authors.initials: D
authors.lastname: Scholes
mesh_terms: D000293:Adolescent; D000328:Adult; D000465:Algorithms; D005260:Female; D006801:Humans; D038801:International Classification of Diseases / Q000592:standards*; D000292:Pelvic Inflammatory Disease / Q000175:diagnosis*; D011237:Predictive Value of Tests; D012680:Sensitivity and Specificity; D055815:Young Adult