2.3. Statistical Analysis
Statistical analysis was performed using the Statistical Package for the
Social Sciences (SPSS Inc. Chicago IL, USA) v. 15.0. Number, percentage
(%), median, and mean ± standard deviation values were used to define
data. The normal distribution of data was tested with the
Kolmogorov-Smirnov test. Student’s t-test was used to compare normally
distributed data, the Mann-Whitney U test to compare non-normally
distributed data, and Pearson’s chi-square or Fisher’s test to compare
categorical variables. The univariate and multivariate logistic
regression analyses were undertaken to determine the relationship
between the presence of the source of infection and clinical risk
factors in thoracic and abdominal CT. Variables with a p value of
<0.1 in the univariate logistic regression analysis were
included in the multivariate logistic regression analysis. A p value of
<0.05 was considered significant in all comparisons.