“…Nineteen studies investigated the association between unspecified substance use and SIB; 15 [ 32 , 38 , 39 , 41 , 47 , 50 , 55 , 56 , 58 , 60 , 61 , 67 , 81 , 83 , 105 ] focused on suicidal ideation, 12 [ 33 , 44 , 47 , 50 , 56 , 58 , 60 , 67 , 81 , 83 , 106 , 107 ] focused on non-fatal suicidal behaviours, and none reported on suicide. Eleven studies [ 36 , 38 , 39 , 47 , 50 , 55 , 56 , 61 , 81 , 83 , 105 ] found a positive association between substance use and suicidal ideation, five [ 32 , 56 , 58 , 67 , 105 ] reported a null association, and three [ 36 , 55 , 60 ] reported unclear findings.…”