Frequency and severity of aggressive incidents in acute psychiatric wards in Switzerland

Table 8 Comparison of incident rates among 6 larger studies in acute wards

Study	Study size¹	treatment days²	% patients involved	Incident rates per 100 treatment days (95%-CI)
				All incidents	Assaults
Swiss results	12 h, 24 w	41'560	13%	1.83 (1.70–1.96)	0.61 (0.53–0.69)
Chou et al [28]	4 h, 7 w	56'000	n.a.	1.53 (1.43–1.63)	0.84 (0.77–0.92)
Grassi et al [29]	1 w	27'375²	8%	1.20 (1.08–1.34)	0.97 (0.86–1.01)
Barlow et al [11]	1 h, 2 w	18'560²	13%	2.05 (1.84–2.27)	0.45 (0.36–0.56)
Mellesdal [30]	1 w	17'430	7%	5.63 (5.28–5.99)	3.15 (2.90–3.43)
Omerov et al [31]	1 h, 2 w	17'400		0.79 (0.66–0.93)	0.60 (0.49–0.72)