| Autor: |
Pearl DL, Louie M, Chui L, Doré K, Grimsrud KM, Martin SW, Michel P, Svenson LW, McEwen SA, Pearl, D L, Louie, M, Chui, L, Doré, K, Grimsrud, K M, Martin, S W, Michel, P, Svenson, L W, McEwen, S A |
| Zdroj: |
Epidemiology & Infection; Jan2007, Vol. 135 Issue 1, p100-109, 10p |
| Abstrakt: |
Using isolates from reported cases of Escherichia coli O157 from Alberta, Canada in 2002, we applied randomization tests to determine if cases associated with an outbreak or statistical space-time cluster had more similar pulsed-field gel electrophoresis patterns, based on Dice coefficients, than expected by chance alone. Within each outbreak and space-time cluster, we assessed the mean, median, 25th percentile, 75th percentile, standard deviation, coefficient of variation, and interquartile range of the Dice coefficients of each pairwise comparison among the isolates. To assess the statistical significance of measures of location (e.g. mean) and variation (e.g. standard deviation) we created randomization distributions using all isolates or only isolates from sporadic cases. We determined that randomization tests are an appropriate tool for evaluating the similarity among isolates from cases that have been linked epidemiologically or statistically. We found little difference between using all cases or only sporadic cases when creating our randomization distributions. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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