Estimated samples sizes based on predictions of aneurysm recurrence rates

Recurrence RatesSample Size Needed
5% vs. 1%530
10% vs. 1%200
10% vs. 5%870
15% vs. 5%282
15% vs. 10%1372
20% vs. 5%152
20% vs. 10%398
20% vs. 15%1812
25% vs. 20%2188
25% vs. 15%500
25% vs. 10%200

  • Note:—Calculations assume 0.05 significance level (alpha) and 0.80 power.