A Readiness Ruler for Assessing Motivation to Change in People with Eating Disorders.

Objective: We examined the psychometric properties of the Eating Disorder Readiness Ruler a simple self-report instrument designed to enable rapid assessment of readiness to change problematic eating behaviours in people with clinical eating disorders.

Method: We administered the ED-RR, the Eating Disorders Examination Questionnaire and a measure of autonomous and controlled motivation for change to 206 individuals receiving outpatient treatment for an eating disorder.

Results: A principal axis factoring analysis of the ED-RR yielded a significant two-factor solution (explaining 59% of variance)-one factor pertaining to restriction and body image preoccupation (four items), the other to binge-eating and vomiting symptoms (two items).