Year range | Follow-up | n | Incidence cases (n) | Incidence rate over 2 years |
---|---|---|---|---|
2001–2002 | Baseline | 7777 | ||
2003–2004 | 2 years | 7285 | 284 | 3.9 |
2005–2006 | 4 years | 6511 | 333 | 5.1 |
2007–2008 | 6 years | 5841 | 257 | 4.4 |
2009–2010 | 8 years | 5826 | 266 | 4.6 |
2011–2012 | 10 years | 5509 | 193 | 3.5 |
2013–2014 | 12 years | 5228 | 157 | 3.0 |