Smartphone-based Mindfulness Training for Health Following Early Life Adversity

Feasibility of Recruitment (Screened Eligible)

Time Frame: assessed pre-enrollment

Recruitment benchmark: \>10% of people screened will be eligible

Feasibility of Retention

Time Frame: assessed across the entire 8-week study period

Retention benchmark: \>80% retention through intervention and \>75% retention through follow-up

Feasibility of Adherence: Intervention Lessons

Time Frame: assessed across the entire 2-week intervention period

Numbers represent percentages of intervention lessons completed in mindfulness and coping groups \[calculated as (average number of lessons completed / 14 total lessons among all participants in each group) \* 100\]. The original adherence benchmark was an average completion of \>85% of intervention lessons; reported percentages that are greater than that benchmark represent feasibility of intervention adherence.

Feasibility of Safe Implementation: Incidence of Treatment-emergent Increases in Mental Health Symptoms

Time Frame: assessed across the entire 8-week study period

Safety benchmark: \<10% of participants showing substantial (\>2SD) increases in anxiety, trauma, or depressive symptoms (using PROMIS Anxiety and Depression scales and Posttraumatic Stress Disorder Checklist-Civilian scale described in other outcomes below) combined to create treatment-emergent symptom rate

Acceptability: Treatment Expectancies

Time Frame: assessed in-person at post-intervention laboratory assessment (an average of 4 weeks) and one-month follow-up laboratory assessment (an average of 8 weeks)

Acceptability of interventions, with benchmark of \>80% of participants giving positive ratings of treatment expectancies (\>3 on 6-item Credibility/Expectancy Questionnaire)

Change in Daily Life Subjective Stress: State Perceived Stress

Time Frame: change in stress assessed in daily life for 1 week at three timepoints: pre-intervention ambulatory assessment, post-intervention ambulatory assessment (an average of 3 weeks), and one-month follow-up ambulatory assessment (an average of 7 weeks)

State perceived stress assessed in daily life four times per day for one week at three time points via Ecological Momentary Assessment (EMA), totaling up to 28 assessments at each time point. All 28 assessments at each of the three time points (pre-intervention ambulatory assessment, post-intervention ambulatory assessment, and one-month follow-up ambulatory assessment) were averaged in MLM analyses. Stress was assessed on a 1-7 Likert scale, with higher scores indicating higher perceived stress.

Change in Daily Life Subjective Stress: Daily Perceived Stress

Time Frame: change in stress assessed in daily life for 1 week at three timepoints: pre-intervention ambulatory assessment, post-intervention ambulatory assessment (an average of 3 weeks), and one-month follow-up ambulatory assessment (an average of 7 weeks)

Daily perceived stress assessed in daily life each evening for one week at three time points via end-of day diary, totaling up to 7 assessments at each time point. All 7 assessments at each of the three time points (pre-intervention ambulatory assessment, post-intervention ambulatory assessment, and one-month follow-up ambulatory assessment) were averaged in MLM analyses. Stress was assessed on a 1-7 Likert scale, with higher scores indicating higher perceived stress.

Change in Daily Life Objective Stress: Stress Events in the Past 2.5 Hours

Time Frame: change in stress assessed in daily life for 1 week at three timepoints: pre-intervention ambulatory assessment, post-intervention ambulatory assessment (an average of 3 weeks), and one-month follow-up ambulatory assessment (an average of 7 weeks)

Stress events assessed on a binary scale (yes/no) in daily life four times per day for one week at three time points via Ecological Momentary Assessment (EMA), totaling up to 28 assessments at each time point. All 28 assessments at each of the three time points (pre-intervention ambulatory assessment, post-intervention ambulatory assessment, and one-month follow-up ambulatory assessment) were averaged in logistic MLM analyses. Outcomes are reported as mean percentage of surveys at each time point that stress events were endorsed, with higher percentages indicating more stress events.

Change in Daily Life Objective Stress: Daily Stress Events

Time Frame: change in stress assessed in daily life for 1 week at three timepoints: pre-intervention ambulatory assessment, post-intervention ambulatory assessment (an average of 3 weeks), and one-month follow-up ambulatory assessment (an average of 7 weeks)

Daily stress events assessed in daily life each evening for one week at three time points via end-of day diary, totaling up to 7 assessments at each time point. All 7 assessments at each of the three time points (pre-intervention ambulatory assessment, post-intervention ambulatory assessment, and one-month follow-up ambulatory assessment) were averaged in logistic MLM analyses. Outcomes are reported as mean percentage of days at each time point that stress events were endorsed, with higher percentages indicating more stress events.

Feasibility of Adherence: Mobile Sensor Data

Time Frame: assessed across the entire 8-week study period

Numbers represent percentages of days on which wearable sensor (Fitbit) data and AWARE phone sensor data were collected in mindfulness and coping groups \[calculated as (average number of days that Fitbit/AWARE data were collected / 56 days among all participants in each group) \* 100\]. The original adherence benchmark was collecting mobile sensor data on \>75% of days; reported percentages that are greater than that benchmark represent feasibility of mobile sensor data collection adherence.

Change in Daily Life Physiological Stress Reactivity

Time Frame: change in HR reactivity assessed in daily life for 1 week at three timepoints: pre-intervention ambulatory assessment, post-intervention ambulatory assessment (an average of 3 weeks), and one-month follow-up ambulatory assessment (an average of 7 weeks)

Heart Rate (HR) measured continuously in daily life, with HR averaged in 30-minute windows around daily life stress reported via EMA up to four times per day for one week at three time points, totaling up to 28 windows at each time point. All (up to) 28 assessments at each of the three time points (pre-intervention ambulatory assessment, post-intervention ambulatory assessment, and one-month follow-up ambulatory assessment) were averaged in MLM analyses. Higher scores indicate higher HR in beats per minute (relative to an individual's average daily HR) at high stress moments (relative to an individual's average perceived stress).

Change in Circulating Inflammatory Markers

Time Frame: change from pre-intervention laboratory assessment to post-intervention laboratory assessment (an average of 4 weeks) and one-month follow-up laboratory assessment (an average of 8 weeks)

Circulating IL-6 assessed via dried blood spot (DBS), reported as raw concentration in pg/mL assessed via ProteinSimple Simple Plex Human IL-6 (3rd gen) on Ella instrument

Feasibility of Recruitment (Enrollment)

Time Frame: assessed pre-enrollment

Recruitment benchmark: \>60% of those eligible will enroll

Feasibility of Adherence: Intervention Practice Prompts

Time Frame: assessed across the entire 2-week intervention period

Numbers represent percentages of intervention practice prompts completed in mindfulness and coping groups \[calculated as (average number of prompts completed / 42 total prompts among all participants in each group) \* 100\]. The original adherence benchmark was an average completion of \>60% of prompts; reported percentages that are greater than that benchmark represent feasibility of intervention practice prompt adherence.

Feasibility of Adherence: Ambulatory Assessments

Time Frame: assessed for 1 week at three time points: pre-intervention ambulatory assessment, post-intervention ambulatory assessment (an average of 3 weeks), and one-month follow-up ambulatory assessment (an average of 7 weeks)

Numbers represent percentages of ambulatory assessment surveys completed in mindfulness and coping groups \[calculated as (average number of surveys completed / 105 total surveys among all participants in each group) \* 100\]. The original adherence benchmark was an average completion of \>75% of ambulatory assessments; reported percentages that are greater than that benchmark represent feasibility of ambulatory assessment adherence.