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Infect Control Hosp Epidemiol. 2005 Apr;26(4):369-73.

Assessment of the value of repeated point-prevalence surveys for analyzing the trend in nosocomial infections.

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Comité de Lutte contre les Infections Nosocomiales, Hôpital de la Conception, 147 bvd Baille, 13385 Marseille cedex 5, France.



To assess the value of repeated point-prevalence surveys in measuring the trend in nosocomial infections after adjustment for case mix.


A 3,500-bed teaching facility composed of 4 acute care hospitals.


From May 1992 to June 1996, eight point-prevalence surveys of nosocomial infections were performed in the hospitals using a sampling process. The trend of adjusted nosocomial infection rates was studied for the four surveys that collected data on indwelling catheters. Adjusted rates were calculated using a logistic regression model and a direct standardization method.


From 1992 to 1996, a total of 20,238 patients were included in the 8 point-prevalence surveys. The nosocomial infection rate decreased from 8.6% in 1992 to 5% in 1996 (P < .001). The analysis of adjusted nosocomial infection rates included 9,600 patients. Four independent risk factors were identified: length of stay greater than 12 days, hospitalization in an intensive care unit, presence of an indwelling urinary catheter, and history of a surgical procedure. After adjustment for case mix, the nosocomial infection rate still showed a downward trend (from 7.2% in 1993 to 5.1% in 1996; P = .02).


Adjusted prevalence rates of nosocomial infections showed a significant downward trend during the period of this study.

[Indexed for MEDLINE]

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