Table 1.

Threefold data collection

Data collection	Participants (in total/3 units)
Demand: actual use of DASA instrument
Prior to the study
Back-translation of instrument	N/A
Training of the nursing staff	N/A
During the study
Daily completion of DASA assessments	N/A
After the study
Information about patients’ treatment days during the study, and realized amount of assessments	DASA assessments (treatment days), potential amount (n=1,116)
	DASA assessments, realized amount (n=716)
Acceptability: patient recruitment ratio; limited efficacy: predictive validity
During the study
Daily DASA assessments	Risk assessments in total (n=178)
	Patients with informed consent (n=12)
Acceptability: patients’ perceptions of strengths and weaknesses of DASA use
Meeting prior to the study
Introduction of the DASA	Patients (n=27)
Procedure of instrument use during the study
Preliminary perceptions of the DASA
Meeting during the study
Strengths and weaknesses of DASA use	Patients (n=26)
Meeting after the study
Strengths and weaknesses of DASA use	Patients (n=19)
	Written feedback (n=5)

Abbreviations: DASA, Dynamic Appraisal of Situational Aggression; N/A, not applicable.