Statistical Analysis
Data analysis was performed with SPSS.
Descriptive statistics : Categorical variables were expressed as
frequency and percentages. Continuous variables were expressed as mean
and standard deviation (SD).
Univariate analysis : differences between the two groups in
continuous variables with normally distributed variables ware analyzed
with student’s T-test. Non normally distributed variables were analyzed
with Mann Whitney U test. Differences between the two groups in
categorical variables was analyzed with Chi-Squared test.