Table 5.

Group by year of studies

Group by year	N	Event rate (% CHE)	Lower limit	Upper limit
2011–2017	25	0.069	0.054	0.095
2006–2010	15	0.045	0.036	0.056
2001–2005	11	0.041	0.024	0.068
< 2001	1	0.053	0.051	0.056
Overall	52	0.053	0.050	0.055