The rate of occurrence of any thromboembolic event during the short- or long-term follow-up will be determined and 95% CI will be calculated. The proportion of patients who developed VTE in each PCP group and the relative 95% CI will be determined, as were the proportions of patients who develope events during the long-term follow up. Paired “t” and Pearson 2 tests were used as indicated; P < .05% (2-tailed) was considered statistically significant. Diagnostic accuracy of D-dimer assessment will be calculated in terms of sensitivity, specificity, and positive and negative predictive values with corresponding 95% CIs (9).