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

Table 5 Percentage of patients involved in aggressive incidents (n = 2017)*

	Patients involved in ...
	... all incidents		... incidents with SOAS-R-severity ≥ 9		... physical attacks		... incidents requiring treatment of the victim
Incidents per patient	n	%	n	%	n	%	n	%
0	1755	87.0%	1827	90.6%	1881	93.3%	1977	98.0%
1	153	7.6%	130	6.4%	97	4.8%	34	1.7%
2	52	2.6%	70	3.5%	26	1.3%	6	0.3%
3–5	34	1.7%	18	0.9%	10	0.5%
6–10	16	0.8%	4	0.2%	2	0.1%
11–20	4	0.2%	3	0.1%	1	0.0%
>20	3	0.1%
Total	2017	100.0%	2017	100.0%	2017	100.0%	2017	100.0%
≥ 1 Incidence	262	13.0%	190	9.4%	136	6.7%	40	2.0%
Patients accounting for 50% of incidents	38	1.9%	41	2.0%	58	2.9	3	0.1%

* Calculations based on index episode (one per patient); 636 incidents, 338 severe incidents, 185 physical attacks, 46 incidents requiring treatment