Statistical Methods
The characteristics of the study patients were expressed as mean or
median, as appropriate for categorical variables, percentages and
variables with continuity. Mann-Whitney U-test and Kruskal-Wallis test
were used for comparing median variables between groups and independent
samples t -test and one-way ANOVA tests were used for comparing
parametric variables. For comparing categorical data, Chi-square and
Fisher’s exact test was used. Cox regression analysis was used to
investigate the risk factors for the development of urinary tract
infection. For all statistical analysis, p value <0.05
was considered significant. All data are analyzed with SPSS (version
20.0; SPSS Inc, Chicago, IL) statistical package.