Measures

The ADIS-C is a semi-structured clinical interview used to assess DSM-IV anxiety diagnoses and symptoms in children and adolescents. The ADIS-C has demonstrated good to excellent reliability across symptom scale scores (Silverman et al., 2001).

The EDE-Q is a 41-item self-report instrument adapted from the Eating Disorders Examination, which provides an overall global severity score and scores on four subscales of eating disordered behavior: restraint, shape concern, weight concern, and eating concern. The EDE-Q has excellent internal consistency and test–retest reliability (Luce and Crowthe, 1999).

The BAI is a 21-item self-report instrument designed to assess the severity of emotional, physiological, and cognitive symptoms of anxiety. Higher total scores reflect greater anxiety symptomology. The BAI has been found to have high internal consistency and moderate to high concurrent validity in an adolescent inpatient population (Jolly et al., 1993).

The STAI is a 40-item self-report instrument, with 20 items assessing for trait anxiety (STAI-Y1) and 20 items assessing for state anxiety (STAI-Y2). Total scores are calculated for each subscale, with higher scores indicating greater severity. The STAI has excellent internal consistency and good test–retest reliability.

The ACQ is a 30-item self-report instrument designed to measure an individual’s perceived control over internal emotional anxiety-related experiences and reactions to anxiety-provoking external events. The ACQ has high internal consistency and has demonstrated good test–retest reliability.

The BDI-II is a 21-item self-report instrument that assesses DSM-IV diagnostic criteria for depression. Higher total scores demonstrate greater severity of depressive symptoms. The BDI-II has good psychometric properties.