Year range | Follow-up | No. | Incidence cases (n) | Incidence rate per 2 years |
---|---|---|---|---|
2001–2002 | Baseline | 5960 | ||
2003–2004 | 2 years | 5624 | 545 | 9.7 |
2005–2006 | 4 years | 4986 | 621 | 12.4 |
2007–2008 | 6 years | 4423 | 407 | 9.2 |
2009–2010 | 8 years | 4438 | 445 | 10.0 |
2011–2012 | 10 years | 4163 | 210 | 5.0 |
2013–2014 | 12 years | 3973 | 250 | 6.3 |