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Statistical evaluation

BB Benjamín Briseño-Marroquín
AC Angelika Callaway
NS Natascha Gol Shalamzari
TW Thomas Gerhard Wolf
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A descriptive statistical evaluation for the numerical continuous variable size of the inhibition zones (mean, median, standard deviation, minima, maxima and percentile) was carried out (SPSS Version 22 for Windows; Chicago, IL, USA; Institute for Medical Biometry, Epidemiology and Informatics, IMBEI, Mainz, Germany). To compare the effects of the three different dilutions per solution, the nonparametric Friedman test for more than two dependent samples was used. The effects of the three different solutions (PAA, NaOCl or CHX) were compared for each bacterial strain by means of the nonparametric test for independent samples using the Kruskal–Wallis test (p < 0.05). The means, standard deviations, and medians were also determined for the colony forming units (Excel 2013; Microsoft, Seattle PO, USA). For comparison of the number of viable bacteria (untreated controls) and those after treatment with 0.5, 1.0 and 2.0% PAA, 1.0, 3.0 and 5.0% NaOCl or 0.12, 0.2 and 2.0% CHX the nonparametric Wilcoxon test for related samples was used (p < 0.05).

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