“…Sample sizes ranged between 95 and 366,348 persons; these were individual participants, as opposed to events of suicidality and self-harm (one participant may experience more than one event of self-harm or suicide attempt). Eight studies did not record the total number of persons [ 29 , 31 , 34 , 35 , 37 , 39 , 41 , 50 ]. Most studies were conducted in England only ( n = 13), with eight in the Republic of Ireland, six in England and Wales, five in Scotland, two in Northern Ireland, and one in Wales only.…”