Validity and Reliability of Thai Psychiatric Aggression Scale
Sunanta Chantakarn MD, PhD, MPE1, Panatda Sriwichit MD1,2, Sontuss Bussaratid MD1, Kitikan Thana-udom MD1
Affiliation : 1 Department of Psychiatry, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand 2 Uthaithani Hospital, Uthaithani, Thailand
Objective : To develop a tool for assessment of aggression in Thai psychiatric patients as well as validation of this scale.
Materials and Methods : This research is an analytical study. The authors generated the scale items by reviewing the actual
aggressive behaviors of psychiatric patients from nurse records and reviewed literature regarding aggression scales and
measurement. Subsequently, the assessments were constructed and piloted with 10 evaluators on 10 examples of aggressive
incidents.
Results : Thai psychiatric aggression scale is composed of verbal aggression, physical aggression, emotional aggression, and
self-harm with total of 18 items. The content validity index was 0.94, and internal consistency, Cronbach’s alpha, was 0.86.
When considered against inter-rater reliability, intraclass correlation revealed a score of 0.97. The test-retest reliability using
Spearman-Brown coefficient was 0.85.
Conclusion : The result of the study demonstrated that the scale is statistically valid and reliable for future clinical assessments
and researches.
Keywords : Psychiatric, Aggression, Validity, Reliability
