Data analysis:
The obtained data were entered into the Statistical Package for Social Sciences (SPSS; version 14.0, SPSS Inc., Chicago, IL, USA). The descriptive data were presented in mean, standard deviation, median, Range for the continuous variable, as well as absolute numbers and percentages for categorical variables. The chi-square test or Fisher’s exact test was utilized to compare the categorical variables between the groups. The continuous variables were compared using a t-test. Binary logistic regression analysis was applied to estimate the odds ratio and find the association between the assessed factors and thrombotic events in the crude model and adjusted model for age and gender. A P-value of less than 0.05 was considered as a significant level.