| Control Group 1 | Group 2 | Group 3 | ||
Day | Mean +/− SD | Mean +/− SD | Percentage efficacy | Mean +/− SD | Percentage efficacy |
Day 172 | 34.1 +/− 5.6 | 3.6 +/− 3.1 | 89.5 | 7.0 +/− 5.8 | 79.5 |
Day 184 | 26.1 +/− 7.2 | 2.4 +/− 2.1 | 90.7 | 0.5 +/− 0.9 | 98.1 |
Day 198 | 33.8 +/− 7.9 | 6.0 +/− 5.1 | 82.2 | 4.1 +/− 4 | 87.8 |
Day 212 | 33.3 +/− 6.5 | 3.4 +/− 1 | 89.7 | 0.0 +/− 0 | 100 |
Day 226 | 32.3 +/− 8.5 | 1.9 +/− 1.9 | 94.2 | 1.4 +/− 2.6 | 95.7 |