The PROMIS Anxiety Score is a computer adaptive measure of feelings of anxiety in the past 7 days. This is a computer-adaptive survey scored on a 5-point Likert scale from 1 (never) to 5 (always) with higher scores indicating increased anxiety. It provides t-scores with a mean of 50 and SD of 10. Higher t-scores indicate higher levels of anxiety.

The Acceptability of Intervention Measure is a 4-item self-report measure scored on a 5-point Likert scale. Scores range from 1 (completely disagree) to 5 (completely agree), with higher scores indicating more acceptability of the intervention.

A measure of fixed versus incremental mindset regarding well-being. The average across items for a possible range in scores from 1-6 will be measured, with higher scores indicating greater levels of incremental views on well-being (i.e., it can be learned).

HMP engagement is a 16-item measure which assess participant's usage experience with the Healthy Minds Program. It is scored on a 5-point Likert scale where 1 = Strongly disagree to 5 = Strongly agree. The total possible range of scores is 0-80 where higher scores indicate more positive engagement with the app.

CUDIT-R is an 8-item survey asking about the participant's relationship to cannabis. It is scored using various scales depending on the item. Scores range from 0 to 32, with higher scores indicating greater risk for cannabis use disorder.

AUDIT is a 10-item survey asking about the participant's relationship to alcohol. It is scored using various scales depending on the item. Scores range from 0 to 40, with higher scores indicating greater risk for alcohol use disorder.

HMI is a 17-item survey scored on a 5-point Likert scale from 0 (never, none, not at all) to 4 (always, every time, to the highest degree) that assesses awareness, connection, insight, and purpose. Higher scores indicate higher sense of awareness, connection, insight, and purpose. Mean score for each subscale will be reported.

Global Health is a participant-reported outcome measure that assesses an individual's overall physical and mental health, including their perceptions of general health. It comprises 10 items, with four items assessing Global Physical Health and four assessing Global Mental Health, all based on five core PROMIS domains: physical function, pain, fatigue, emotional distress, and social health. The scores, ranging from 0 to 20, represent the individual's perception of their health, with lower scores indicating greater impairment.

The RRS is a 10-item, 4-point measure of rumination. Each item indicates the frequency of each event by rating a four-point Likert scale ranging from 1 (Almost never) to 4 (Almost always). The total score ranges from 10-40, with higher scores indicating increased tendency to ruminate.

BFI-2-XS is a 15-item questionnaire designed to assess the Big Five personality domains: Extraversion; Agreeableness; Conscientiousness; Negative Emotionality; and, Open-Mindedness. Each trait is assessed with three items, and the total score for each trait ranges from 3 to 15, with higher scores indicating a stronger tendency towards that trait.

MAQ is a 12-item self-report scale designed to assess both the quantity and quality of mindfulness-based practice (MBP), including formal and informal practices. Two items assess the duration of formal practice. The remaining ten items use a 7-point Likert scale ranging from 0 (Never) to 6 (Always) to measure these aspects of mindfulness practice. Scores range from 0-60. Higher scores on the MAQ generally indicate higher levels of practice and/or better quality of practice.

SCS-SF is a 12-item survey asking how the participant relates to themself. It is scored on a 5-point Likert scale, where 1 = Almost never and 5 = Almost always. Scores range from 12-60, with higher scores indicating greater self-compassion.

The Flourishing Index is a 10-item questionnaire where participants report their general level of flourishing (e.g., well-being, health, etc.). It is scored on a 0 to 10-point scale, with anchors varying across items. The total score ranges from 0 to 100 with higher scores indicating higher flourishing.

DWAI is a six-item questionnaire designed to assess the therapeutic alliance within the Healthy Minds Program (HMP) app. It measures the user's connection and agreement with the app, focusing on the bond, tasks, and goals of the therapeutic relationship. It is scored on a 7-point Likert scale, with scores ranging from 6-42. Higher scores indicate a stronger working alliance with the HMP app.

The PROMIS Sleep Disturbance Score is a measure of sleep in the past 7 days. This is a computer-adaptive survey scored on a 5-point Likert scale with higher scores indicating increased sleep disturbance. It provides t-scores with a mean of 50 and SD of 10. Higher t scores indicate higher levels of sleep disturbances.

The PROMIS Meaning and Purpose is a computer-adaptive measures which assesses one's sense of life having purpose and that there are good reasons for living. It is scored on a 5-point Likert scale where 1 = strongly disagree to 5 = strongly agree. Higher scores indicate hopefulness, optimism, goal-directedness, and feelings that one's life is worthy. It provides t-scores with a mean of 50 and a standard deviation of 10 in the general population.

The Decentering subscale of the Experience Questionnaire is an 11-item questionnaire where participants report on their ability to decenter from their experience. It is scored on a 5-point Likert scale where 1 = never to 5 = all the time. The total possible range of scores is 11-55 where higher scores indicate a greater ability to decenter from experience.

The NIH Toolbox Loneliness is a 5-item questionnaire where participants report how often in the past week they have felt loneliness. It is scored on a 5-point Likert scale where 1 = never to 5 = always. The total possible range of scores is 5-25 where higher scores indicate a greater sense of loneliness.

The FFMQ-Acting with Awareness subscale is an 8-item survey scored on a 5-point Likert scale from 'never, or very rarely true' to 'very often or always true', for a total possible range of scores from 8-40 where higher scores indicate greater mindfulness awareness.

The FFMQ- Non-reactivity subscale is a 7-item survey scored on a 5-point Likert scale from 1 = 'never, or very rarely true' to 5 = 'very often or always true', for a total possible range of scores from 7-35 where higher scores indicate greater ability to actively detach from negative thoughts and emotions.

PSS is a 10-item survey scored on a 5-point Likert scale from 0 = never to 4 = very often, for a total possible range of scores from 0-40 where higher scores indicate higher perceived stress.

Morning daily diary will include single-item measures of mindfulness, decentering, connection, purpose, depression, anxiety, happiness, energy, stress, busyness, rumination (2 items), sleep quality, motivation to practice meditation, and expectations and challenges related to using the HMP. Each item will be rated on a 5-point Likert scale (1 = not at all, 5 = very much). Higher scores indicate greater levels of the respective construct, such as higher mindfulness, greater decentering, stronger sense of purpose, greater happiness, more severe depression or anxiety, better sleep quality, or greater motivation and perceived helpfulness or frustration with HMP use that morning.

Evening daily diary will include single-item measures of mindfulness, decentering, connection, purpose, depression, anxiety, happiness, energy, happy event, stress exposure, rumination (2 items), and expectations related to using the HMP. Each item will be rated on a 5-point Likert scale (1 = not at all, 5 = very much). Higher scores indicate greater levels of the respective construct, such as higher mindfulness, greater decentering, stronger sense of purpose, more severe depression or anxiety, happy event and stressor exposure experience, or greater motivation and perceived helpfulness with HMP use that day.

Participants' engagement in formal mindfulness practice will be assessed twice a day with a binary yes/no response.

Participants' engagement in informal mindfulness practice will be assessed twice a day with a 5-point Likert scale (1 = not at all, 5 = all day long).

Participants will indicate whether they received a text message from the study that day (yes/no). If they respond "yes," they will then report whether the message encouraged them to apply a wellbeing strategy (yes/no) and rate the extent to which they applied the strategy in their day-to-day activities on a 5-point Likert scale (1 = not at all, 5 = very much).

MBP-MRAES is an 11-item questionnaire which measures distressing experiences associated with meditation practice. The first ten items use a frequency-based scale with the following response options: Never, A few days to 1 week, 1 week to 1 month, 1 month to 1 year, and 1 year or longer. If a participant selects any response other than Never, they are prompted with a follow-up question asking them to rate the experience on a scale from Very distressing to Very positive. The eleventh item is an open-ended question that invites participants to describe any other significant symptoms they may have experienced.

An item about lasting bad effects from the HMP app will be scored on a 5-point scale from 1 = strongly disagree to 5 = strongly agree.

The 3-item Medication and Therapy Questionnaire collects information on whether participants received medication or therapy for mental health concerns in the past month. Each item is a yes/no question.

The 5-item Meditation and App usage Questionnaire assesses participants' engagement with meditation-related activities over two timeframes: the past month (at Week 4) and the past three months (at the 3-month follow-up). Three items ask whether participants used a meditation app, meditated with others, or attended a meditation class or group. Two additional items gather details about the specific meditation app used and the frequency of its use.

The hospitalization form collects participants' hospitalization history since last survey.