Table 1

Study sample described by report period and level of harm

Reporting period	Group	Group size, N	Level of Harm			Total
Reporting period	Group	Group size, N	None	Low	Moderate	Total
April 2005–2009	1	18 039	2162	846	631	3639
2010–2011	2	12 660	2237	894	770	3901
2012–September 2013	3	11 198	2292	1721	947	4960
			6691	3461	2348	12 500