Compliance was 80%(95% CI 76% to 84%) with the standard method and 77% (95% CI 72% to 81%) with the improved method. The difference in compliance between the 2 methods, 3%, was not found to be significant (95% CI for the difference was -3% to 9%).
However, the slot coverage rate with the improved method, 98%(95% CI 93% to 99%), was 18% higher than that with the standard method's 80% (95% CI 76% to 84%).