"Post-operative infections are a recognized problem in the medical and hospital professions. Annual costs and deaths due to infections in the U.S.A. have been estimated at $8-$9 billion and 10,000 lives respectively. The air lS one potential path in transporting contaminants that may cause an infection. Yet, the degree of influence airborne contaminants have in causing infections is a topic of much debate. As a result of the need for more information in this area, this investigation was undertaken to determine the degree of correlation between post-operative infection rates, bacteria in the air, and air flow rates.
Data for the analysis was obtained from twenty-four independent, published studies that examined air flow rates, bacteria in the air and infection rates. A total of 85 individual experiments are included in the 24 studies.
Spearman's Rank Correlation Coefficient and Kendall's Rank Correlation Coefficient non-parametric, statistical tests were applied to the data to determine the correlation coefficients and their statistical significance. Three cases were examined under each test: infection rate v.s. bacteria counts; infection rates v.s. air flow rates; and air flow rates v.s. bacteria counts.
A .78 correlation coefficient was found between bacteria/cu.ft.air and post-operative infection rates; a .94 correlation coefficient between post-operative infection rates and air changes/hr.; and a .79 correlation coefficient between air changes/hr. and bacteria/ cu.ft.air.
These results, based on the data used, indicate a strong relationship between: a) the ability of air flow systems to remove bacteria from the air; b) the influence of bacteria in the air on post-operative infection rates, and; c) the role of air flow systems in minimizing post-operative infection rates"--Abstract, pages ii-iii.
Wiebe, Henry Allen
Carmichael, Ronald L., 1921-2006
Engineering Management and Systems Engineering
M.S. in Engineering Management
University of Missouri--Rolla
ix, 88 pages
© 1973 Carl Eugene Intag, All rights reserved.
Thesis - Restricted Access
Library of Congress Subject Headings
Nosocomial infections -- Epidemiology
Cross infection -- Epidemiology
Surgery -- Complications
Print OCLC #
Electronic OCLC #
Link to Catalog RecordElectronic access to the full-text of this document is restricted to Missouri S&T users. Otherwise, request this publication directly from Missouri S&T Library or contact your local library. http://laurel.lso.missouri.edu/record=b1066652~S5
Intag, Carl Eugene, "An investigation into the degree of correlation between air flow rates, bacteria in the air and post-operative infections in hospitals" (1973). Masters Theses. 3565.