Internet-based Treatment of Generalized Anxiety Disorder

• Change from baseline in Penn State Worry Questionnaire (PSWQ) [ Time Frame: 24 hours ] [ Designated as safety issue: No ]
  Measures anxiety symtoms related to Generalized Anxiety Disorder. 16 items.
• Change from baseline in Penn State Worry Questionnaire (PSWQ) [ Time Frame: 6 months ] [ Designated as safety issue: No ]
  Measures anxiety symtoms related to Generalized Anxiety Disorder. 16 items.
• Change from baseline in Penn State Worry Questionnaire (PSWQ) [ Time Frame: 12 months ] [ Designated as safety issue: No ]
  Measures anxiety symtoms related to Generalized Anxiety Disorder. 16 items.
• Change from baseline in Penn State Worry Questionnaire (PSWQ) [ Time Frame: 24 months ] [ Designated as safety issue: No ]
  Measures anxiety symtoms related to Generalized Anxiety Disorder. 16 items.

• Change from baseline in Beck Anxiety Inventory (BAI) [ Time Frame: 24 hours ] [ Designated as safety issue: No ]
  21 item rating scale for anxiety symptoms.
• Change from baseline in Beck Anxiety Inventory (BAI) [ Time Frame: 6 months ] [ Designated as safety issue: No ]
  21 item rating scale for anxiety symptoms.
• Change from baseline in Beck Anxiety Inventory (BAI) [ Time Frame: 12 months ] [ Designated as safety issue: No ]
  21 item rating scale for anxiety symptoms.
• Change from baseline in Beck Anxiety Inventory (BAI) [ Time Frame: 24 months ] [ Designated as safety issue: No ]
  21 item rating scale for anxiety symptoms.
• Change from baseline in Quality Of Life Inventory (QOLI) [ Time Frame: 24 hours ] [ Designated as safety issue: No ]
  The QOLI assessment yields an overall score and a profile of problems and strengths in 16 areas of life such as love, work and play. The QOLI test is a measure of positive psychology and positive mental health.
• Change from baseline in Quality Of Life Inventory (QOLI) [ Time Frame: 6 months ] [ Designated as safety issue: No ]
  The QOLI assessment yields an overall score and a profile of problems and strengths in 16 areas of life such as love, work and play. The QOLI test is a measure of positive psychology and positive mental health.
• Change from baseline in Quality Of Life Inventory (QOLI) [ Time Frame: 12 months ] [ Designated as safety issue: No ]
  The QOLI assessment yields an overall score and a profile of problems and strengths in 16 areas of life such as love, work and play. The QOLI test is a measure of positive psychology and positive mental health.
• Change from baseline in Quality Of Life Inventory (QOLI) [ Time Frame: 24 months ] [ Designated as safety issue: No ]
  The QOLI assessment yields an overall score and a profile of problems and strengths in 16 areas of life such as love, work and play. The QOLI test is a measure of positive psychology and positive mental health.
• Change from baseline in Montgomery-Åsberg Depression Rating Scale (MADRS) [ Time Frame: 24 hours ] [ Designated as safety issue: No ]
  9-item depression rating scale.
• Change from baseline in Montgomery-Åsberg Depression Rating Scale (MADRS) [ Time Frame: 6 months ] [ Designated as safety issue: No ]
  9-item depression rating scale.
• Change from baseline in Montgomery-Åsberg Depression Rating Scale (MADRS) [ Time Frame: 12 months ] [ Designated as safety issue: No ]
  9-item depression rating scale.
• Change from baseline in Montgomery-Åsberg Depression Rating Scale (MADRS) [ Time Frame: 24 months ] [ Designated as safety issue: No ]
  9-item depression rating scale.
• Change from baseline in Patient Health Questionnaire (PHQ-9) [ Time Frame: Weekly during treatment period ] [ Designated as safety issue: No ]
  The PHQ-9 is the nine item depression scale of the Patient Health Questionnaire. The PHQ-9 is a powerful tool for assisting primary care clinicians in diagnosing depression as well as selecting and monitoring treatment. The PHQ-9 is based directly on the diagnostic criteria for major depressive disorder in the Diagnostic and Statistical Manual Fourth Edition (DSM-IV).
• Change from baseline in Patient Health Questionnaire (PHQ-9) [ Time Frame: 24 hours ] [ Designated as safety issue: No ]
  The PHQ-9 is the nine item depression scale of the Patient Health Questionnaire. The PHQ-9 is a powerful tool for assisting primary care clinicians in diagnosing depression as well as selecting and monitoring treatment. The PHQ-9 is based directly on the diagnostic criteria for major depressive disorder in the Diagnostic and Statistical Manual Fourth Edition (DSM-IV).
• Change from baseline in Patient Health Questionnaire (PHQ-9) [ Time Frame: 6 months ] [ Designated as safety issue: No ]
  The PHQ-9 is the nine item depression scale of the Patient Health Questionnaire. The PHQ-9 is a powerful tool for assisting primary care clinicians in diagnosing depression as well as selecting and monitoring treatment. The PHQ-9 is based directly on the diagnostic criteria for major depressive disorder in the Diagnostic and Statistical Manual Fourth Edition (DSM-IV).
• Change from baseline in Patient Health Questionnaire (PHQ-9) [ Time Frame: 12 months ] [ Designated as safety issue: No ]
  The PHQ-9 is the nine item depression scale of the Patient Health Questionnaire. The PHQ-9 is a powerful tool for assisting primary care clinicians in diagnosing depression as well as selecting and monitoring treatment. The PHQ-9 is based directly on the diagnostic criteria for major depressive disorder in the Diagnostic and Statistical Manual Fourth Edition (DSM-IV).
• Change from baseline in Patient Health Questionnaire (PHQ-9) [ Time Frame: 24 months ] [ Designated as safety issue: No ]
  The PHQ-9 is the nine item depression scale of the Patient Health Questionnaire. The PHQ-9 is a powerful tool for assisting primary care clinicians in diagnosing depression as well as selecting and monitoring treatment. The PHQ-9 is based directly on the diagnostic criteria for major depressive disorder in the Diagnostic and Statistical Manual Fourth Edition (DSM-IV).
• Change from baseline in Generalized Anxiety Disorder-7 (GAD-7) [ Time Frame: Weekly during treatment period ] [ Designated as safety issue: No ]
  7-item screening form for Generalized Anxiety Disorder.
• Change from baseline in Generalized Anxiety Disorder-7 (GAD-7) [ Time Frame: 24 hours ] [ Designated as safety issue: No ]
  7-item screening form for Generalized Anxiety Disorder.
• Change from baseline in Generalized Anxiety Disorder-7 (GAD-7) [ Time Frame: 6 months ] [ Designated as safety issue: No ]
  7-item screening form for Generalized Anxiety Disorder.
• Change from baseline in Generalized Anxiety Disorder-7 (GAD-7) [ Time Frame: 12 months ] [ Designated as safety issue: No ]
  7-item screening form for Generalized Anxiety Disorder.
• Change from baseline in Generalized Anxiety Disorder-7 (GAD-7) [ Time Frame: 24 months ] [ Designated as safety issue: No ]
  7-item screening form for Generalized Anxiety Disorder.

The purpose of this study is to determine whether internet-administered cognitive behavior therapy is a feasible treatment for generalized anxiety disorder.

• Experimental: iCBT
  Receives treatment.
  Intervention: Behavioral: Internet-based cognitive behavioral therapy (iCBT)
• No Intervention: Waiting list control group
  The waiting list control group initially receives no treatment, but do weekly screenings. After 9 weeks, the control group receives the same treatment as the other study arm.
  Intervention: Behavioral: Internet-based cognitive behavioral therapy (iCBT)

Inclusion Criteria:

• Satisfy DSM-IV criteria for generalized anxiety disorder
• Living in Sweden and being able to read Swedish
• Access to computer with internet connection

Exclusion Criteria:

• Currently receiving other psychological treatment
• Non-stable use of psychoactive medication
• Deemed suicidal
• Deemed to suffer from other psychological disorder, e.g. psychosis, bipolarity etc.