Interobserver Reliability: Inter-rater correlation of the total score has been found to exceed 0.70 (Corrigan & Bogner, 1995). Class Correlation (CC) of 0.920 for the total score and for the subscale: Disinhibition CC of 0.902; Aggression CC of 0.090; Lability CC of 0.726 (Bogner et al., 1999). Results from a long term care facility also indicates good inter-rater reliability with a CC of 0.906 for the total score, 0.870 for Disinhibition, 0.886 for Aggression and 0.860 for Lability. Amato et al. (2012) found that when 30 patients were assessed, inter-rater reliability between an RN and an unlicensed caregiver was exact 71% of the time. 23% were within two points, and 6% were within 3-5 points of each other.

Internal Consistency: Cronbach’s scores have consistently been above 0.838 to 0.914 (Bogner et al., 1999; Corrigan, 1989; Corrigan & Deming, 1995). Theta scores ranged from 0.845-0.920 indicating adequate internal consistency (Corrigan, 1989) . When the scale was tested to determine its internal consistency with individuals living in a long term care facility, Cronbach was 0.808 and 0.740 (Bogner et al., 1999).

Concurrent Validity: The correlations between the ABS and the Braintree Agitation Scale GCOP and GCOD were consistently high (p<0.001) (Corrigan, 1989).

Construct Validity: Agitation was also found to be correlated with the Orientation Group Monitoring System (r=-0.529, p<0.001) and the Mini-Mental State Exam (MMSE; r=-0.526, p<0.001) (Corrigan & Mysiw, 1988).

Predictive Validity: Improvement on various cognition scales (MMS and the FIM Cognition) have been found to predict a decrease in ABS scores (Bogner et al., 2000; Corrigan & Bogner, 1995).