Comparison of two procedures to estimate the hospital stay attributable to nosocomial infection : Matched cohort study versus analysis of covariance of the total unmatched cohort.
We compare the results of a matched cohort study with those yielded by analysis of covariance (ANCOVA) in the cohort where the matched study was nested to assess whether the matching design underestimates (as it has been assumed) the extra length of hospitalization due to nosocomial infection.
A total of 218 patients developed hospital infection in a cohort of 1483 general surgery patients ; 161 were successfully matched 1 :
A total of 218 patients developed hospital infection in a cohort of 1483 general surgery patients ;
1 for surgical procedure,
ASA score, age (± 10 years), emergency-scheduled surgery, preoperative stay, and, whenever possible, number of diagnoses and sex.
Unmatched infected patients (57,23.1%) were different from matched ones.
There were no differences for the variables between matched infected patients and their pairs.
The matched cohort study overestimates the extra LOH due to hospital infection.
The use of ANCOVA in the total cohort obviates the selection bias of the matched cohort design.
Mots-clés Pascal : Infection nosocomiale, Hospitalisation, Temps séjour, Risque, Service hospitalier, Chirurgie, Epidémiologie, Analyse statistique, Evaluation performance, Méthodologie, Homme, Espagne, Europe, Etude comparative
Mots-clés Pascal anglais : Nosocomial infection, Hospitalization, Residence time, Risk, Hospital ward, Surgery, Epidemiology, Statistical analysis, Performance evaluation, Methodology, Human, Spain, Europe, Comparative study
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 98-0202647
Code Inist : 002B30A01A1. Création : 11/09/1998.