Sample size
THROMBOEMBOLIC EVENT, COMPLICATION
Sample calculations of the thromboembolic event rate, overall complication rate, and local complication rate were performed, namely, power analysis. The effect size was 0.881, 0.520, and 0.797, respectively. The calculated power values were 0.999, 0.957, and 0.999, respectively. The sample size calculated according to a statistical power of 0.80 required 11 cases, 30 cases, and 13 cases, respectively. Hence, our sample size (50) was sufficient to obtain results of our main observations.