Background: This study compares disability levels between different anxiety disorders and healthy controls. We further investigate the role of anxiety arousal and avoidance behaviour in disability, and whether differences in these symptom patterns contribute to disability differences between anxiety disorders.
Methods: Data were from 1826 subjects from the Netherlands Study of Depression and Anxiety (NESDA). The Composite Interview Diagnostic Instrument was used to diagnose anxiety disorders. The World Health Organization Disability Assessment Schedule II was used to measure disability in six domains (cognition, mobility, selfcare, social interaction, life activities, participation). Severity of anxiety arousal and avoidance behaviour symptoms was measured using the Beck Anxiety Inventory and the Fear Questionnaire.
Results: All anxiety disorders were associated with higher disability. Disability was generally highest in multiple anxiety disorder (e.g. mean disability in cognition=33.7) and social anxiety disorder (mean=32.7), followed by generalized anxiety disorder (mean=27.2) and panic disorder with agoraphobia (mean=26.3), and lowest in panic disorder without agoraphobia (mean=22.1). Anxiety arousal was more associated with disability in life activities (B=8.5, p<0.001) and participation (B=9.9, p<0.001) whereas avoidance behaviour was more associated with disability in cognition (B=7.4, p<0.001) and social interaction (B=8.6, p<0.001). Different disability patterns between anxiety disorders were not completely explained by anxiety arousal and avoidance behaviour.
Limitations: The cross-sectional study design precludes any causal interpretations. In order to examine the full range of comorbidity among anxiety, a greater range of anxiety disorders would have been preferable.
Conclusions: Disability is highest in social anxiety disorder and multiple anxiety disorder. Both anxiety arousal and avoidance behaviour are associated with higher disability levels but do not fully explain the differences across anxiety disorders.
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