Evaluation of an Acceptance and Commitment Therapy-Based Narrative Intervention for Individuals Taking Antidepressants

Patient Health Questionnaire 9-item (PHQ-9; Kroenke et al., 2001): The PHQ is a 9-item measure of depression severity, which asks respondents to report their frequency of depressive symptoms over the past two weeks, rated from 0 "not at all" to 3 "nearly every day". The PHQ-9 provides a total score which indicates current depression severity according to the following levels: minimal, mild, moderate, moderately severe, and severe. Higher scores indicate higher depression.

Short Form Health Survey (SF-12; Ware et al., 1996): The SF-12 is a 12-item measure of quality of life and general functioning. Respondents are asked to rate their present level of health or emotion-related impairment in daily activities. Items are rated on a scale from 1 "all of the time" to 6 "none of the time," with higher scores indicating greater health-related quality of life.

Acceptance and Action Questionnaire-II (AAQ-II; Bond et al., 2011): The AAQ-II is a 10-item measure of psychological inflexibility and experiential avoidance. Items are rated on a 7-point scale ranging from 1 "never true" to 7 "always true." A total score is calculated by reverse coding so that higher scores indicate greater psychological flexibility.

General Help Seeking Questionnaire (GHSQ; Wilson, Deane, Ciarocchi, & Rickwood): We will use an adapted version of the GHSQ which is a validated measure of help-seeking intentions from a variety of formal (e.g. psychologist, PCP) and informal (e.g. friends, family) supports, rated on a 7-point scale from 1 "extremely likely" to 7 "extremely unlikely," with higher scores on each item indicating greater likelihood of seeking help from that source.

Participants will be asked to rate their adherence to the homework exercises from the online program on a 7-point scale from 1 "did no recommended assignments" to 7 "did all recommended assignments," using a scale adapted from previous self-help studies (Abramowitz, Moore, Braddock, & Harrington, 2009). Higher scores on this measure indicate greater treatment adherence.

System Usability Scale (SUS; Brooke, 1996): The SUS is a 10-item measure of usability and satisfaction with programs with established reliability and validity (Lewis, 2009). Items on the SUS are rated on a scale from 1 "strongly disagree" to 5 "strongly disagree, with higher scores indicating greater treatment satisfaction. We will additionally ask those in the active condition a series of free-response questions assessing their favorite and least favorite aspects of LifeStories, as well as their perspectives on how using the program may have helped them manage depression.

We will ask participants at baseline and post-treatment a series of yes/no questions that we constructed which ask if they are engaged in treatment with a mental health specialist, are planning to see a mental health specialist, or have made any recent changes to their antidepressant treatment.