Outcome
Type |
Measure |
Description |
Time frame |
Safety issue |
Other |
Feedback Form Questionnaire |
Measure of intervention acceptability and credibility. As well as items that are rated on continuous scales, there are open-ended questions to provide feedback on aspects they found helpful, unhelpful, liked, disliked and general improvements. |
post-intervention at week 4 |
|
Primary |
Change in Padua Inventory-Washington State University Revision |
Self-report questionnaire of obsessive compulsive symptoms composed of 39 items on a 5-point scale. Total score ranges from 0 to 156. Higher scores indicate greater severity of obsessive-compulsive symptoms (worse outcome). |
Screen, Baseline (pre-intervention), post-intervention at week 4, 1-month follow-up |
|
Primary |
Change in Obsessive Beliefs Questionnaire-44 |
Self-report questionnaire of maladaptive obsessive-compulsive beliefs composed of 44 items on a 7-point scale. Total score ranges from 44 to 308. Higher score indicates that the individual has more maladaptive obsessive-compulsive beliefs (worse outcome). |
Baseline (pre-intervention), post-intervention at week 4, 1-month follow-up |
|
Primary |
Change in OC bias index |
Measure of interpretation biases. It is a computerized task that requires participants to read and imagine themselves in 10 OC-relevant test scenarios and 10 non OC-relevant scenarios with a title and missing letter in the final word of the sentence. Participants are then provided with a recognition rating form where they see the title of only the 10 OC-relevant scenarios in which they had previously imagined themselves. Each title corresponds with four different interpretations; target bias (OC-Positive and OC-Negative), and foil bias (Foil Positive and Foil Negative). Participants are asked to rate (on a 4-point scale) each sentence independently in terms of how similar each interpretation option is to the meaning of the scenario they had previously read. Target and Foil Bias Index scores are calculated by subtracting ratings for negative items from ratings for positive items. A positive score indicates that the individual has more OC-positive interpretations (better outcome). |
Baseline (pre-intervention), post-intervention at week 4 |
|
Primary |
Change in dot-probe task |
Measure of attention biases. Participants are presented 48 trials comprising all combinations of probe type ("?" or "?"), probe position (top or bottom), and picture type (neutral or threat). Each trial begins with the presentation of a central fixation cross for 500 ms. The cross is then replaced by a picture pair presented in the center of the screen for 500ms. After 500 ms, both stimuli disappear and a probe is shown in the location of one of the stimuli. Participants are instructed to indicate as quickly as possible which probe was shown via using keyboardResponse latencies are averaged to provide a single mean reaction time score for each participant. Scores are calculated by subtracting response latencies for trials in which the probe replaces threat stimuli from response latencies for trials in which the probe replaces neutral stimuli. subtracting the average. A negative bias score indicates an attention bias away from threat-related pictures (better outcome). |
Baseline (pre-intervention), post-intervention at week 4 |
|
Secondary |
Change in Depression Anxiety Stress Scale-21 |
Self-report questionnaire of the negative emotional states of depression, anxiety and stress composed of 21 questions on a 4-point scale. There are three subscales; (1) depression, (2) anxiety, and (3) stress. There are seven items in each of the subscales; the score of which ranges from 0 to 21. Higher scores indicate greater depression, anxiety anda stress (worse outcome). |
Baseline (pre-intervention), post-intervention at week 4, 1-month follow-up |
|
Secondary |
Change in Positive and Negative Affect Schedule |
Self-report questionnaire of positive and negative affect composed of 20 items with 10 positive and 10 negative affective descriptors on a 5-point scale. The positive and negative affect scales each have a potential range of 10-50. Higher scores on positive affect scale indicate higher positive affect (better outcome) whereas Higher scores on negative affect scale indicate higher negative affect (worse outcome). |
Baseline (pre-intervention), post-intervention at week 4, 1-month follow-up |
|