“…There is currently no national data on the nursing workforce variables we report, although several papers suggest that, per week per ward, between 44 and 455 hrs of nursing time is spent on special observation (Childs, Thomas, & Tibbles, 1994;Porter, McCann, & McGregor, 1998 Fottrell et al (1978) surveyed violence in a UK hospital, and it is possible to estimate a figure of 0.68 incidents per 100 bed days from their data, with a similar study providing an estimate of 0.63 per 100 bed days for 1987 (Noble & Rodger, 1989). Both these figures are based on all types of wards, and are higher than the figure of 0.43 per 100 bed days for all aggression found during this study of acute wards only.…”