Development of the Riverview Psychiatric Inventory.

Area of Science:

• Psychiatry
• Psychometrics
• Clinical Psychology

Background:

• Behavioral rating scales are essential tools in psychiatric assessment.
• Existing scales may require extensive training, limiting their routine use.
• A need exists for a valid, reliable, and easily administered scale for psychiatric inpatients.

Purpose of the Study:

• To develop and validate the Riverview Psychiatric Inventory (RPI), a novel behavioral rating scale.
• To assess the psychometric properties, including reliability and validity, of the RPI.
• To evaluate the RPI's utility in distinguishing patient groups across different psychiatric treatment units.

Main Methods:

• Development of a 36-item scale with four subscales: daily routine, psychological symptoms, social interaction, and aggressive behavior.
• Interrater reliability was assessed using 70 rater pairs on 145 patients.
• Internal consistency was calculated using Cronbach's alpha.
• Content and construct validity were evaluated on 359 adult psychiatric inpatients.

Main Results:

• The RPI demonstrated excellent interrater reliability (coefficient = .89).
• High internal consistency was found for the total score (alpha = .93) and subscales (alpha range = .76–.87).
• The RPI total score significantly differentiated patient groups across psychiatric hospital units, supporting its validity.

Conclusions:

• The Riverview Psychiatric Inventory (RPI) is a psychometrically sound and reliable behavioral assessment tool.
• The RPI is suitable for routine use in busy psychiatric settings due to its ease of administration and scoring.
• The scale effectively aids in the assessment and differentiation of psychiatric patient populations.