title: Hospital stay length as an effect modifier of other risk factors for nosocomial infection.
abstract: This paper addresses the problem of hospital stay length as a risk factor for nosocomial infection and as a modifier of the effect of other risk factors for hospital infection. Patients were selected form two cross-sectional studies done in two different seasons of 1986. Risk of infection rose fairly steadily as hospital stay length increased (correlation coefficient: 0.83, p less than 0.01). Several risk factors (operation, underlying disease, and age) were analyzed on the basis of 1) raw data and 2) data stratified by length of stay. The results showed that hospital stay length is a strong modifier of the remaining risk factors, generally reducing, their effect on the development of hospital infection as length of stay increases.
authors.affiliation: Department of Social and Preventive Medicine, University Hospital of Granada, Facultad de Medicina Avda, Spain.
authors.forename: M
authors.initials: M
authors.lastname: Delgado-Rodríguez
authors.forename: A
authors.initials: A
authors.lastname: Bueno-Cavanillas
authors.forename: R
authors.initials: R
authors.lastname: López-Gigosos
authors.forename: J
authors.initials: J
authors.lastname: de Dios Luna-Castillo
authors.forename: J
authors.initials: J
authors.lastname: Guillén-Solvas
authors.forename: O
authors.initials: O
authors.lastname: Moreno-Abril
authors.forename: B
authors.initials: B
authors.lastname: Rodríguez-Tuñas
authors.forename: A
authors.initials: A
authors.lastname: Cueto-Espinar
authors.forename: R
authors.initials: R
authors.lastname: Rodríguez-Contreras
authors.forename: R
authors.initials: R
authors.lastname: Gálvez-Vargas
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D003428:Cross Infection / Q000453:epidemiology*; D015987:Effect Modifier, Epidemiologic; D004812:Epidemiologic Methods; D005260:Female; D006801:Humans; D007902:Length of Stay; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D012189:Retrospective Studies; D012307:Risk Factors