Statistical Analysis
Data analyses were examined by using Statistical Package for Social
Sciences (SPSS), Version 20.0 for Windows (SPSS Inc., Chicago, IL, USA).
The variables were investigated using visual (histograms, probability
plots) and analytical methods (Kolmogorov-Simirnov test) whether or not
they were normally distributed. Normally distributed variables were
shown by using means and standard deviations, and non-normaly
distributed variables were shown by using median and range (maximum and
minimum). The chi-square test was used to analyze of categorical
variables. Correlations of parameters were studied using Pearson or
Spearman correlations. Multiple groups were compared using one-way
analysis of variance (ANOVA) with a post-hoc Bonferroni correction and
Kruskal-Wallis test for the normally and non-normally distributed
variables, respectively. The indepenĀdent variables for duration of
hospital stay were investigated by using stepwise multiple linear
regression analysis. P values <0.05 were considered
statistically significant.