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

Table 2 Incidence rates

	n	Rate per 100 treatment days	95% CI	Rate per bed per year	% of calendar days with ≥ 1 incident
All incidents	760	1.829	1.701 – 1.963	7.08	14.2
Incidents with SOAS-R severity ≥ 9	396	0.950	0.859 – 1.049	3.32	10.0
Physical aggression	403	0.970	0.877 – 1.069	3.77	10.3
Purely Verbal aggression	357	0.859	0.772 – 0.953	3.34	9.3
Physical attacks	252	0.606	0.534 – 0.686	2.35	7.9
Incident requiring treatment of the victim	57	0.137	0.104 – 0.178	0.53	2.3