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Table 3 Interpretation of the extended version of the BVC, obtained from the derivation data-set

From: Predicting inpatient violence using an extended version of the Brøset-Violence-Checklist: instrument development and clinical application

BVC-VAS Score

Odds ratio (95% CI) validation sample

Interpretation

0 – 3 Points

1.0 (reference group)

Very low risk (< 1 of 300 patients will attack a person)

4 – 6 Points

5.5 (2.0–15.0)

Low risk (about 1 out of 100 patients will attack a person)

7 – 9 Points

23.2 (8.7–62.1)

Moderate risk (about 1 out of 10 patients will attack a person)

10–12 Points

53.2 (16.9–168)

High risk (about 1 out of 4 to 5 patients risk will attack a person)

  1. Due to the small number of attacks in the derivation dataset, modeling of risk categories as separate dummy variables was not possible. The odds ratio per increase in category (e.g. from 0-3 points to 4-6 points) amounted to 7.4 (95% CI 4.0-13.8). The interpretation is based on the observed incidence rate of attacks in a larger epidemiological study in Swiss acute psychiatry wards.