Online Peer-Delivered Group CBT for PPD

The Edinburgh Postnatal Depression Scale (EPDS) is the 10-item gold standard measure of PPD. Total scores range from 0-30 with higher scores indicating worse depressive symptoms.. A score ≥13 is consistent with PPD and changes in scores >4 are accepted as being indicative of clinically significant change

The Edinburgh Postnatal Depression Scale (EPDS) is the 10-item gold standard measure of PPD. Total scores range from 0-30 with higher scores indicating worse depressive symptoms.. A score ≥13 is consistent with PPD and changes in scores >4 are accepted as being indicative of clinically significant change

A brief structured interview for the major Axis 1 psychiatric disorders in the Diagnostic and Statistical Manual of Mental Disorders 5th Edition (DSM 5) . Major Depressive Disorder Module to determine if participants meet diagnostic criteria for PPD at 9 weeks

A brief structured interview for the major Axis 1 psychiatric disorders in the Diagnostic and Statistical Manual of Mental Disorders 5th Edition (DSM 5). Major Depressive Disorder Module to determine if participants meet diagnostic criteria for PPD at six months

The Generalized Anxiety Disorder 7-Item Scale (GAD-7) (32) is a self-report scale that taps generalized anxiety disorder, the most common comorbidity of PPD. Items are scored on a 4-point scale from 0 to 3, with a higher score indicating an increased risk of GAD. A cutoff of ≥11 defines clinically important levels of anxiety symptoms.

The Generalized Anxiety Disorder 7-Item Scale (GAD-7) (32) is a self-report scale that taps generalized anxiety disorder, the most common comorbidity of PPD. Items are scored on a 4-point scale from 0 to 3, with a higher score indicating an increased risk of GAD. A cutoff of ≥11 defines clinically important levels of anxiety symptoms.

A 12-item scale designed to measure perceived social support from three sources: (1) family, (2) friends and (3) significant other. Items are scored on a 7-point scale, and total scores range from 12-84 with higher scores indicating a higher level of perceived social support. A score of 12-35 indicates low perceived social support, 36-60 indicates medium perceived social support and 61-84 indicates high perceived social support.

A 12-item scale designed to measure perceived social support from three sources: (1) family, (2) friends and (3) significant other. Items are scored on a 7-point scale, and total scores range from 12-84 with higher scores indicating a higher level of perceived social support. A score of 12-35 indicates low perceived social support, 36-60 indicates medium perceived social support and 61-84 indicates high perceived social support.

The Postpartum Bonding Questionnaire (PBQ) is a 25-item maternal-report measure that assesses four aspects of maternal-infant relations: (1) bonding, (2) rejection and anger towards the infant, (3) infant-focused anxiety and (4) incipient abuse. Subscales 1-3 will be explored as a continuous outcome using subscale total score. Each item is scored on a scale of 0-5, with higher scores suggestive of more problems. Mother-infant bonding will be measured as a continuous and dichotomous outcome, using cut-off scores for each subscale indicating bonding disorders. Cutoff values of 12 for the bonding subscale, 17 for rejection and anger, and 10 for infant-focused anxiety have been proposed to define bonding disorders in each category.

The Postpartum Bonding Questionnaire (PBQ) is a 25-item maternal-report measure that assesses four aspects of maternal-infant relations: (1) bonding, (2) rejection and anger towards the infant, (3) infant-focused anxiety and (4) incipient abuse. Subscales 1-3 will be explored as a continuous outcome using subscale total score. Each item is scored on a scale of 0-5, with higher scores suggestive of more problems. Mother-infant bonding will be measured as a continuous and dichotomous outcome, using cut-off scores for each subscale indicating bonding disorders. Cutoff values of 12 for the bonding subscale, 17 for rejection and anger, and 10 for infant-focused anxiety have been proposed to define bonding disorders in each category.

The Infant Behaviour Questionnaire-Revised (Very Short Form) (IBQR) is a parent-report measure of infant temperament. The IBQ-R (Very Short Form) consists of 37 items answered on a 7-point scale (1-7) and assesses 3 factors: Positive Affectivity/Surgency with 13 items, Negative Emotionality with 12 items, and Orienting/Regulatory Capacity with 12 items; higher scores indicate greater alignment with the domain.

The Infant Behaviour Questionnaire-Revised (Very Short Form) (IBQR) is a parent-report measure of infant temperament. The IBQ-R (Very Short Form) consists of 37 items answered on a 7-point scale (1-7) and assesses 3 factors: Positive Affectivity/Surgency with 13 items, Negative Emotionality with 12 items, and Orienting/Regulatory Capacity with 12 items; higher scores indicate greater alignment with the domain.

A utility-based health-related quality of life self-report instrument consisting of five questions covering mobility, self-care, usual activities, pain/discomfort and depression/anxiety. Quality of Life will be calculated using the Canadian scoring algorithm by multiplying the health utility for the corresponding time period (ie. area under the curve approach).

A utility-based health-related quality of life self-report instrument consisting of five questions covering mobility, self-care, usual activities, pain/discomfort and depression/anxiety. Quality of Life will be calculated using the Canadian scoring algorithm by multiplying the health utility for the corresponding time period (ie. area under the curve approach).

Healthcare resource utilization data will be collected using a questionnaire used in prior work and adapted for the postpartum period based on the Canadian Community Health Survey and Service Use and Resources Form. Participants will be asked to provide information on health care resource use including diagnoses and procedures, medications, hospital stays, physician and ER visits and the use of all other services (including those relating to mental health). The investigators will measure resources consumed from the perspective of public health care payer and corresponding unit costs will be calculated using provincial billing rates.

Healthcare resource utilization data will be collected using a questionnaire used in prior work and adapted for the postpartum period based on the Canadian Community Health Survey and Service Use and Resources Form. Participants will be asked to provide information on health care resource use including diagnoses and procedures, medications, hospital stays, physician and ER visits and the use of all other services (including those relating to mental health). The investigators will measure resources consumed from the perspective of public health care payer and corresponding unit costs will be calculated using provincial billing rates.

Intervention participants only. An 8-item scale that measures and assesses consumer satisfaction with health and human services. Items are scored on a 4-point scale and total scores range from 8-32, with higher scores indicating greater satisfaction.

Intervention participants only. A 16-item maternal-report measure designed to assess cognitive and behavioural skills acquisition. Each item is scored on a 5-point scale, and total scores range from 16-80. Higher cognitive restructuring and behavioural activation scores predict reduction of overall psychiatric symptoms and depression.

Intervention participants only. A 16-item maternal-report measure designed to assess cognitive and behavioural skills acquisition. Each item is scored on a 5-point scale, and total scores range from 16-80. Higher cognitive restructuring and behavioural activation scores predict reduction of overall psychiatric symptoms and depression.

Intervention participants only. A 12-item maternal-report measure that assesses three aspects of therapeutic alliance:(1) agreement on the tasks of therapy, (2) agreement on the goals of therapy and (3) development of an affective bond. Items are rated on a 5-point scale, and total scores range from 12-60 with higher scores indicating a better therapeutic alliance.

Intervention participants only. A 12-item maternal-report measure that assesses three aspects of therapeutic alliance:(1) agreement on the tasks of therapy, (2) agreement on the goals of therapy and (3) development of an affective bond. Items are rated on a 5-point scale, and total scores range from 12-60 with higher scores indicating a better therapeutic alliance.

Intervention participants only. A 4-scale maternal-report measure used to evaluate therapy quality. Subscale 1 will be explored which includes 17 statements about possible actions and behaviours of a peer support worker. Items are scored on a 5 point-scale, with "not applicable" available as a sixth option (this score is excluded when total score is calculated). The score range for Subscale 1 is 17-85 with a higher score indicating more positive feelings about the therapist's integrity.

Intervention participants only. A 4-scale maternal-report measure used to evaluate therapy quality. Subscale 1 will be explored which includes 17 statements about possible actions and behaviours of a peer support worker. Items are scored on a 5 point-scale, with "not applicable" available as a sixth option (this score is excluded when total score is calculated). The score range for Subscale 1 is 17-85 with a higher score indicating more positive feelings about the therapist's integrity.

An 8-item self-report measure that assesses individuals' perception of four therapeutic factors in group settings: (1) instillation of hope, (2) secure emotional expression, (3) awareness of relational impact, and (4) social learning.

An 8-item self-report measure that assesses individuals' perception of four therapeutic factors in group settings: (1) instillation of hope, (2) secure emotional expression, (3) awareness of relational impact, and (4) social learning.

9 individual checklists that measure the degree to which a peer leader is consistent with the intervention manual when applying techniques. The nine sessions vary in content, so this scale consists of different items for each session and assesses topics including agenda setting, content delivery, and homework review. Individual items are rated on a 3-4-point Likert scale ranging from 0 (not covered at all) to 3 (or 4) thorough coverage. Total adherence scores range from 15 (session 4, 6, 9) to 31 (session 1). These checklists are used by the peers, expert therapist (psychiatrist) and a graduate student

This one checklist measures the level of skill and judgement that a peer leader demonstrates when delivering the intervention. This scale assesses structure and use of time, genuineness, empathy, collaboration, guided discovery, group participation, and eliciting emotional expression. Competence scores range from 0-42 with a higher score indicating greater competence.