Number of individuals that score above the midpoint on each sub-scale of the Credibility and Expectancy Questionnaire (CEQ). Through two subscales, the CEQ assesses participants' perceptions that a program is logical (credible) and their expectancy that participation would lead to improvements (expectancy). Scores on the credibility subscale range from 3-27 (midpoint 15) and scores on the expectancy factor range from 3-31 (midpoint 17); higher scores on each indicate greater credibility and expectancy.

Measures dispositional mindfulness, total scores range from 12-48, higher values reflect higher levels of mindfulness. A positive mean change in the total score reflected increased dispositional mindfulness.

7-item measure that assesses perceived social support. Higher scores indicate greater social support. Total scores range from 8 to 34. A positive mean change in the total score indicates increases in perceived social support.

Assesses ability to engage in a series of healthy coping skills (e.g., relaxation, social support, adaptive thinking). Higher scores indicate a stronger ability to recognize stress and cope. Scores are averaged and range from 0-4. A positive change in the MOCS-A average score indicates improvements in coping.

26-item measure assessing quality of life across four domains: physical health, psychological health, social relationships, and environment. Higher scores indicate higher quality of life for all domains. Scores in each domain range from 4 to 20. Scores were assessed at pre- and post-test; a positive mean change score in each domain indicates improved quality f life.

Questionnaire that assesses perceptions of dyadic interactions from both members of the relationship. The caregiver version is 11 items and the patient version is 10 items. Scores are calculated for two subscales: dyadic strain (scores range from 0-15) and positive interactions (scores range from 0-18). Lower scores on the dyadic strain subscale and greater scores on the positive interactions subscale indicate fewer relationship stressors and more positive aspects of the relationship.

Measures perceived quality of dyad's communication and proficiency in using adaptive dyadic coping skills. Subscales are summed for a total subscale score. Higher scores indicate greater quality communication and/or coping.

Stress communicated by oneself measures how well stress is communicated by oneself to their partner Range 4-20.

Stress communicated by one's partner Measures how well one's partner communicates about their stress. Range 4-20.

Supportive coping provided by one's partner Measures the quality of emotional and/or problem-focused support provided by one's partner Range 5-25.

Negative dyadic coping by one's partner Measures the degree that one's partner uses hostile, ambivalent, and superficial actions/words that have deleterious intentions. Range 4-20.

Joint or common coping Measures the degree to which dyads work together to manage stress.Range 5-25.

Evaluation of dyadic coping Measures perception of the quality of the dyad's approach to coping.Range 2-10.

15-item questionnaire measuring how participants use mindfulness when facing stressors. Scores range from 0 to 60 with higher scores indicating greater use of mindfulness practices.

For caregivers, this scale measures caregiver preparedness to care for survivor. In this study, for survivor participants, we adapted the language to measure preparedness to care for oneself. Scores range from 0 to 32 Higher scores indicate greater perceived readiness for caregiving (for caregivers) or for survivorship (for survivors).

10 items measuring presence of meaning and purpose in life. Assesses two dimensions: presence and search. Items are rated on a 7-point scale from 1 (Absolutely Untrue) to 7 (Absolutely True). Both presence of meaning and search for meaning subscale scores range from 5-35. Higher scores indicate greater presence and search.

Measures participant's gratitude disposition. Each item is rated on a 7-point Likert scale. Scores range from 6 to 42. Higher scores indicate a more grateful disposition.

14 total participants (7 dyads) participated

14 total participants (7 dyads) participated

14 total participants (7 dyads) participated

Marital status (married)

14 total participants (7 dyads) participated

Assessment feasibility was assessed by the number of individual participants (not dyads) that have no measures missing on all self-report questionnaires.

We analyzed 14 individual participants (7 survivors and 7 caregivers) for this benchmark, not dyads.

Adherence feasibility was assessed by the number of CA survivor-caregiver dyads who begin the intervention and adhere to it by completing at least 4 of 6 intervention sessions.

We analyzed 7 units (dyads), which is comprised of 14 participants (7 survivors and 7 caregivers).

Number of sessions in which the therapist adhered 100% to the treatment manual. The study coordinator listened to 9 random RT-CA sessions, and, using a checklist, identified whether the study clinician fully adhered to the content of each session by delivering each key ingredient of the session.

Each unit of analysis was a session recording listened to at random by the research coordinator, which they rated the degree to which the study clinician delivered all key ingredients (rated as fully adherent or not adherent).

The proportion of participants that scored above the midpoint on the Client Satisfaction Questionnaire-3 (CSQ-3), which assesses satisfaction with a program. Total scores range from 3-12 (midpoint 7.5); higher scores indicate greater satisfaction.

Analysis population was number of participants that scores above the midpoint on the CSQ-3, not dyads.

Number of individuals that score above the midpoint on each sub-scale of the Credibility and Expectancy Questionnaire (CEQ). Through two subscales, the CEQ assesses participants' perceptions that a program is logical (credible) and their expectancy that participation would lead to improvements (expectancy). Scores on the credibility subscale range from 3-27 (midpoint 15) and scores on the expectancy factor range from 3-31 (midpoint 17); higher scores on each indicate greater credibility and expectancy.

For credibility and expectancy, we analyzed individual participant responses on each sub scale (Credibility and expectancy).

Assesses emotional distress in medical patients; total scale ranges from 0-42, higher scores represent worse distress. A negative mean change in the total score means emotional distress improved.

Analyzed change in total score in individual survivors and caregivers

20-item questionnaire that measures post-traumatic stress disorder symptoms. Scores range from 0 to 80, with higher scores indicating greater severity and intensity of symptoms. A negative change in the total score represents improvement in symptoms.

Analyzed change in 7 survivors and 7 caregivers

Measures dispositional mindfulness, total scores range from 12-48, higher values reflect higher levels of mindfulness. A positive mean change in the total score reflected increased dispositional mindfulness.

Analyzed change in 7 survivors and 7 caregivers

7-item measure that assesses perceived social support. Higher scores indicate greater social support. Total scores range from 8 to 34. A positive mean change in the total score indicates increases in perceived social support.

Analyzed change in 7 survivors and 7 caregivers

Assesses ability to engage in a series of healthy coping skills (e.g., relaxation, social support, adaptive thinking). Higher scores indicate a stronger ability to recognize stress and cope. Scores are averaged and range from 0-4. A positive change in the MOCS-A average score indicates improvements in coping.

Analyzed change in 7 survivors and 7 caregivers

26-item measure assessing quality of life across four domains: physical health, psychological health, social relationships, and environment. Higher scores indicate higher quality of life for all domains. Scores in each domain range from 4 to 20. Scores were assessed at pre- and post-test; a positive mean change score in each domain indicates improved quality f life.

7 survivors and 7 caregivers

Questionnaire that assesses perceptions of dyadic interactions from both members of the relationship. The caregiver version is 11 items and the patient version is 10 items. Scores are calculated for two subscales: dyadic strain (scores range from 0-15) and positive interactions (scores range from 0-18). Lower scores on the dyadic strain subscale and greater scores on the positive interactions subscale indicate fewer relationship stressors and more positive aspects of the relationship.

7 survivors 7 caregivers

Measures perceived quality of dyad's communication and proficiency in using adaptive dyadic coping skills. Subscales are summed for a total subscale score. Higher scores indicate greater quality communication and/or coping.

Stress communicated by oneself measures how well stress is communicated by oneself to their partner Range 4-20.

Stress communicated by one's partner Measures how well one's partner communicates about their stress. Range 4-20.

Supportive coping provided by one's partner Measures the quality of emotional and/or problem-focused support provided by one's partner Range 5-25.

Negative dyadic coping by one's partner Measures the degree that one's partner uses hostile, ambivalent, and superficial actions/words that have deleterious intentions. Range 4-20.

Joint or common coping Measures the degree to which dyads work together to manage stress.Range 5-25.

Evaluation of dyadic coping Measures perception of the quality of the dyad's approach to coping.Range 2-10.

Analyzed change in 7 survivors and 7 caregivers

15-item questionnaire measuring how participants use mindfulness when facing stressors. Scores range from 0 to 60 with higher scores indicating greater use of mindfulness practices.

7 survivors 7 caregivers

For caregivers, this scale measures caregiver preparedness to care for survivor. In this study, for survivor participants, we adapted the language to measure preparedness to care for oneself. Scores range from 0 to 32 Higher scores indicate greater perceived readiness for caregiving (for caregivers) or for survivorship (for survivors).

7 survivors 7 caregivers

10 items measuring presence of meaning and purpose in life. Assesses two dimensions: presence and search. Items are rated on a 7-point scale from 1 (Absolutely Untrue) to 7 (Absolutely True). Both presence of meaning and search for meaning subscale scores range from 5-35. Higher scores indicate greater presence and search.

7 survivors 7 caregivers

Measures participant's gratitude disposition. Each item is rated on a 7-point Likert scale. Scores range from 6 to 42. Higher scores indicate a more grateful disposition.

7 survivors 7 caregivers

This arm represents the caregivers that participated in the intervention.

Dyads of cardiac arrest survivors and their caregivers participated in 6 30-minute skills-based sessions. Sessions included provision of anticipatory guidance and and resources to manage cardiac arrest-specific stressors. A clinical psychologist delivered all of the sessions. The main intervention goal was to provide dyads with resiliency skills and resources to reduce emotional distress and prevent chronic distress.

Recovering Together after Cardiac Arrest: The intervention taught resiliency skills (mindfulness, coping, etc.) to dyads and provider anticipatory guidance and resources to manage stressors specific to cardiac arrest. These sessions took place in person or on Zoom/telephone, depending on the participant's preference and access to technology.