The Overall Anxiety Severity and Impairment Scale as an Outcome Measure in Internet-Delivered Cognitive Behavioral Therapy for Anxiety Disorders: Observational Study

Boris Karpov   ^{1 *} , MD, PhD ;   Jari Olavi Lipsanen   ^{2 *} , PhD ;   Ville Ritola   ^{1 *} ;   Tom Rosenström   ^{3 *} , PhD ;   Suoma Saarni   ⁴ , MD, PhD ;   Satu Pihlaja   ⁴ ;   Jan-Henry Stenberg   ^{4 *} , PhD ;   Paula Laizane   ^{5 *} ;   Grigori Joffe   ^{4 *} , MD, PhD

¹ Department of Psychiatry, Helsinki University Hospital, Helsinki, Finland

² Finnish Psychological Association, Helsinki, Finland

³ Department of Psychology and Logopedics, Faculty of Medicine, University of Helsinki, Helsinki, Finland

⁴ Department of Psychiatry, Helsinki University Hospital, University of Helsinki, Helsinki, Finland

⁵ Riga Stradins University, Riga, Latvia

*these authors contributed equally