title: Absence of significant differences in intestinal parasite prevalence estimates after examination of either one or two stool specimens.
abstract: The authors undertook a retrospective search of intestinal parasite laboratory records obtained from 200 consecutive-day pairs of stool specimens to compare prevalence estimates from the first and second stool examinations. The laboratory results had previously been recorded as part of a screening program offered to Southeast Asian refugees arriving in Montréal, Québec, Canada, between July 1982 and February 1983. No statistically significant differences in either overall prevalences or parasite-specific prevalences were observed. This suggests that, at least in some population-based situations, single stool examinations provide estimates of intestinal parasite prevalence which are as valid as those from the routine examination of two consecutive-day specimens. Blinded studies must be undertaken to accurately assess the true value of multiple specimen submission in epidemiologic studies.
authors.affiliation: Department of Epidemiology and Biostatistics, McGill University, Montreal General Hospital, Québec, Canada.
authors.forename: T W
authors.initials: TW
authors.lastname: Gyorkos
authors.forename: J D
authors.initials: JD
authors.lastname: MacLean
authors.forename: C G
authors.initials: CG
authors.lastname: Law
mesh_terms: D001210:Asia, Southeastern / Q000208:ethnology; D002170:Canada; D016009:Chi-Square Distribution; D005243:Feces / Q000469:parasitology*; D006373:Helminthiasis / Q000453:epidemiology; D006801:Humans; D007411:Intestinal Diseases, Parasitic / Q000453:epidemiology* / Q000208:ethnology; D008403:Mass Screening; D011528:Protozoan Infections / Q000453:epidemiology; D012036:Refugees; D012189:Retrospective Studies