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. 2008 Nov 15;198(10):1420–1426. doi: 10.1086/592711

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© 2008 by the Infectious Diseases Society of America

This article is made available via the PMC Open Access Subset for unrestricted re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for the duration of the COVID-19 pandemic or until permissions are revoked in writing. Upon expiration of these permissions, PMC is granted a perpetual license to make this article available via PMC and Europe PMC, consistent with existing copyright protections.

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Contrast of populations with a size above the median (High pop) and those with a size below the median (Low pop). The rates of febrile respiratory illness (FRI) for these populations were significantly different. Although the units closed to an influx of potentially infectious convalescing persons (hereafter referred to as “closed units”) generally had higher FRI rates than the units open to such an influx (hereafter referred to as “open units”), the difference was not significant. Logistic regression of the odds of an FRI diagnosis, in terms of the population size and unit type, showed that the difference in population size remained even after adjusting for unit type.