| Baseline | 6 month | 6 month change | 12 month | 12 month change | 18 month | 18 month change | 24 month | 24 month change | |
| All participants | 7.7 | 6.9 | -0.8 | 6.6 | -1.1 | 6.9 | -0.8 | 6.4 | -1.3 |
| Type 1 | 8.7 | 7.7 | -0.9 | 7.3 | -1.4 | 7.6 | -1.1 | 7.2 | -1.5 |
| Type 2 | 7.8 | 6.9 | -0.9 | 6.0 | -1.8 | 6.4 | -1.4 | 6.5 | -1.4 |
| Pre | 7.1 | 6.5 | -0.6 | 6.5 | -0.6 | 6.8 | -0.4 | 5.8 | -1.3 |