IPT-based Group Intervention by Non-specialist for Improvement of Depressive Symptoms in Community Young Adults in Brazil

The Hospital Anxiety and Depression Scale consists of 14 items, of which 7 assess anxiety and 7 assess depression. Each item is scored from 0 to 3, and each subscale has a maximum score of 21 points with higher scores indicating greater symptom severity.

The PHQ-9 is a self-administered instrument that quantitatively assesses the severity of depressive symptoms over the past two weeks. It consists of nine items corresponding to the diagnostic criteria for major depressive disorder in the DSM-IV. Each item is scored on a 4-point Likert scale (0 = not at all to 3 = nearly every day), resulting in a score ranging from 0 to 27.

The Medical Outcomes Study Social Support Survey (MOS-SSS) measures each individual's perceptions of personal support. The scale comprises five support factors (emotional, informational, material, affective, and positive social interaction). Higher scores indicate greater perceived support.

The WHOQOL-BREF is a scale with 26 items that measure quality of life. It includes two general items and 24 items representing four domains (physical, psychological, social relationships, and environmental).

The Clinical Global Impressions (CGI) scale is an instrument that enables clinicians to assess the overall severity of the illness, the change in clinical status over time, and the effectiveness of the intervention used. Its score can range from 1 (not ill) to 7 (extremely ill).

It's a self-report instrument and assesses the presence and severity of depressive symptoms. It consists of 21 items describing cognitive, affective, and somatic manifestations of depression. Each item is scored in a Likert scale ranging from 0 to 3, varying from 0 to 63 points

The 10-item Connor-Davidson Resilience Scale (CD-RISC-10) is an abbreviated version of the original 25-item scale. It measures the capacity to adapt physically, mentally, and spiritually to the circumstances imposed by life. The 10 items are scored from 0 to 4, yielding a total score from 0 to 40. Higher scores indicate higher levels of resilience.

It allows finding, classifying and discriminating between undesirable effects, adverse reactions to treatment and side effects of psychotherapy, based on the assessment of possible domains of unwanted effects in severity and relationship with the treatment.

The Childhood Trauma Questionnaire is a retrospective self-report instrument designed to assess experiences of childhood abuse and neglect. It consists of 28 items scored on a 5-point Likert scale, measuring five domains of maltreatment: emotional abuse, physical abuse, sexual abuse, emotional neglect, and physical neglect.

It assesses through closed questions, with dichotomous answers (yes vs. no), covering stressful life events.

The Relationship Scales Questionnaire (RSQ) assesses attachment styles in interpersonal relationships. It consists of 30 items describing thoughts and feelings in close relationships. Respondents rate their agreement with each item on a 5-point Likert scale. It assesses attachment through 30 declarative statements that express feelings and thoughts related to close relationships with people.

It is a self-administered questionnaire composed of 24 items divided into four domains: the three dimensions of personality (neuroticism, extraversion, and psychoticism) and a validity scale (social desirability).