Evaluating the Effectiveness of Mobile Self-guided Psychological Interventions to Reduce Relapse in Substance Use Disorder

Problematic alcohol use will be measured with an Alcohol Use Disorders Identification Test (AUDIT). AUDIT assesses the amount and frequency of alcohol intake (items 1-3), alcohol dependence (questions 4-6), and problems related to alcohol consumption (items 7-10). Questions 1 to 8 are scored on a 5-point scale ranging from 0 to 4, and questions 9 and 10 are scored as 0, 2, or 4. Total scores range from 0 to 40, and the cut-off point to identify hazardous alcohol intake is 8, a score between 16 and 19 indicates harmful alcohol use, and scores above 20 points indicate possible alcohol use disorder. Participants will answer the questions in terms of standard drinks.

The Severity of Dependence Scale (SDS) will be used to provide a self-reported measure of psychological aspects of stimulants and alcohol dependence. A five-items, one-dimensional tool has uniform scale for questions 1 - 4 from 0 ('never or almost never') to 3 ('always'). Question 5 has the same scale with different signature where 0 means 'not difficult at all' and 3 means 'impossible'. Score ranging from 0 to 15, where cut-off score depends on user's drug type - a cut-off of =< 3 has been used for indexing alcohol dependence and =< 5 for indexing amphetamine dependence.

Cannabis Use Disorders Identification Test-Revised (CUDIT-R) will be administered in a group of patients with cannabis addiction to assess cannabis consumption, abuse, dependence, and psychological features. The questionnaire consists of 7 items scored on a 0-4 scale, and the last question is scored on a three point scale (0-2-4). Scores of 8 or more indicate hazardous cannabis use, and the cut-off for possible cannabis use disorder is =<12 points.

Drug Use Disorders Identification Test (DUDIT) is an 11-item screening questionnaire measuring drug intake and severity of substance ause and dependence. Items 1 to 9 are scored on a five-point Likert scale, and items 10 and 11 are scored on a three-point scale (0-2-4). Scores of 25 points or more are probably indicative of heavy dependence on drugs.

Hospital Anxiety and Depression Scale (HADS) is a 14-item questionnaire with two subscales, each consisting of 7 items. For both subscales, scores between 8-10 indicate mild depression or anxiety, and scores in the range of 11-21 are indicative of depression or anxiety disorder.

Emotion regulation will be assessed with Difficulties in Emotion Regulation Scale (DERS), a 36-item questionnaire, rated on a scale from 1 (almost never) to 5 (almost always). It consists of 6 subscales. Higher scores suggest greater difficulties in emotion regulation.

Participants' satisfaction with their life will be assessed with The Satisfaction With Life Scale (SWLS), Polish version from Jankowski (2015). SWLS is a short self-report instrument on which participants indicate their agreement to five statements about life satisfaction on a seven-point Likert scale. A maximum score of 35 can be reached, indicating a high level of life satisfaction.

Coping Orientation to Problems Experienced (mini-COPE) questionnaire measures coping styles used to deal with difficult situations It consists of 28 items and three subscales corresponding to three coping styles. Higher scores on each of the subscale indicate increased usage of a corresponding coping style.

Impulsive Behavior Scale (SUPPS) is a 20-item measure of impulsive traits. It consists of 20 items, with answers ranging from 1 = 'strongly agree' to 4 = 'strongly disagree'.

Brief Sensation Seeking Scale (BSSS) is a short, 8-item scale measuring sensation seeking. Responses are made on a 5-point scale, where higher score indicate stronger agreement. Higher scores indicate more impulsive behavior.