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

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

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)
  1. 1 h = hospitals, w = wards; 2 calculated assuming 95%-occupancy