“…Literature on staffing levels and outcomes in psychiatric wards is limited and has shown that the presence of regular staff on wards had an association with lower rates of incidents of physical aggression, self-harm and violent incidents (Bowers, Allan, Simpson, Nijman, & Warren, 2005;Chou, Lu, & Mao, 2002;Lanza, Kayne, Hicks, & Milner, 1994). Literature also reports that more staff can lead to more violence (Owen, Tarantello, Jones, & Tennant, 1998), and some studies report no connection between staff/patient ratios and outcomes (Ellsworth et al, 1979). More recent data from the City-128 study, which collected end-of-shift reports on patient outcomes (conflicts and containment) for 6 months from a random sample of 136 English acute psychiatric wards, showed that regular qualified nurse staffing levels in the preceding shifts were associated with raised conflict and containment levels.…”