Evaluating the Impacts of a Well-Being Mobile App in Mexico

Measured using the World Health Organization-Five Well-Being Index (who-5). The raw score ranges from zero to 25, zero representing worst possible mental well-being and 25 representing best possible mental well-being.

Measured using General Anxiety Disorder-7 scale (GAD-7). This is calculated by assigning scores of 0, 1, 2, and 3 to the response categories, respectively, of "not at all," "several days," "more than half the days," and "nearly every day." GAD-7 total score for the seven items ranges from 0 to 21. The definitions are:

0-4: minimal anxiety (better outcome) 5-9: mild anxiety 10-14: moderate anxiety 15-21: severe anxiety (worse outcome)

Mesured using Personal Health Questionnaire Depression Scale (PHQ-8). This is calculated by assigning scores of 0, 1, 2, and 3 to the response categories, respectively, of "not at all," "several days," "more than half the days," and "nearly every day." PHQ-8 total score for the eight items ranges from 0 to 24. The definitions are:

Less than 5: Minimal depression (better outcome) 5-9: Mild depression 10-14: Moderate depression 15-19: Moderately severe depression More or equal to 20: Severe depression (worse outcome)

Measured using Perceived Stress Scale 4 (PSS-4). The scores range from 0 to 16 where higher scores are correlated to more stress (worse outcome)

Number of days in the last seven days the participant used TikTok

Measured through a purposely designed "emoji" survey, where the participants is asked how the participant is feeling. The options are very well, neutral, very bad. After it is constructed as a dummy variable that takes value of one if the participant answered "very well" or zero otherwise

hours slept the night before

The number of times participants experienced sleep interruptions the night before

number of days in the last seven days the participant has used Facebook

If the participant visit recently a therapist

Performance on an incentive-compatible, real-effort task, where the participant needs to count the number of zeros in matrices of five columns and five rows where there are zeros and ones. The measure is the correct answers within one minute

reaction time in the emotional Stroop task, specifically for matching colors of emotionally salient words.

The emotional Stroop task is a variation of the Stroop effect that explores how emotional stimuli impact cognitive processing. Participants are presented with words in different colors and asked to name the ink color while ignoring the word's meaning. Longer reaction times for emotional words (e.g., "fear," "sadness") compared to neutral words (e.g., "table," "chair") indicate interference from the emotional content

The index is calculated following Anderson (2008) and includes six standardized outcomes: the number of days in the last seven days the person exercised, went outside, did not miss work, did not raise her voice in anger, helped with homework, and had 10 minutes of self-time.

Emotional and social isolation, measured by the Gierveld Loneliness Scale. It has a range of scores from 0 (least lonely, better outcome) to 6 (most lonely, worse outcome)

measured using the Generalized Self-Efficacy Scale (GSE). The total score ranges between 10 and 40, with a higher score indicating more self-efficacy (better outcome).

number of days in the last seven days the participant has used X

Number of days in the last seven days the participant used Instagram