Adolescents will be asked to respond to 18 items (e.g., It's hard for me to ask others to do things with me; 1 = Not at all; 5 = All the time) that assess social anxiety. The measure has three factors: Fear of Negative Evaluation, Social Avoidance and Distress-New; Social Avoidance and Distress. Responses will be summed across each of the three factors. The minimum scale score is 1 and the maximum scale score is 40. Higher scores indicate greater social anxiety.

Adolescents will be asked to respond to a total of 7 items that assess their overall health and wellbeing using the PROMIS Pediatric Scale - Global Health 7 measure. Adolescents will respond to 4 items (e.g., In general, would you say your quality of life is…; 5 = Excellent, 1 = Poor); 1 item (e.g., How often do you feel really sad; 5 = Never; 1 = Always); and 2 items (e.g., How often do you have fun with friends?; 5 = Always; 1 = Never). Responses were summed across the 7 items to create a single global health score. The scoring table in the PROMIS Global Health Scoring manual was used to convert a summed global health score into a T score value for each participant. The T score has a mean of 50 with a standard deviation of 10. Higher T scores on this measure represent greater adolescent overall health and wellbeing.

Parents will be asked to respond to 24 questions (e.g., Responds positively to neutral or friendly overtures by peers; 1= Never; 4 = Always) that assess parent ratings of their adolescents' emotion regulatory abilities. There are two subscales for this measure: Emotion Regulation and Negativity. Responses will be averaged across the two subscales and the minimum scale score is 1 and the maximum scale score is 4. Higher scores indicate greater use of the emotion regulation strategy.

Parents will be asked to respond to 24 questions (e.g., Has difficulty thinking ahead or learning from experience; 1 = Definitely not true; 5 = Definitely true) that assess parent ratings of their adolescents' executive functioning. There are four subscales: Working Memory, Planning, Inhibition, and Regulation. Responses will be averaged across the four subscales and the minimum scale score is 1 and the maximum scale score is 5. Higher scores indicate greater executive functioning deficit.

Parents will be asked to respond to 8 questions (e.g., My child worries about things; 0 = Never; 3 = Always) that assess parent ratings of their adolescents' anxiety. Responses will be summed across the 8 items and the minimum scale score is 0 and the maximum scale score is 24. Higher scores indicate greater anxiety.

Parents will be asked to respond to a total of 7 items that assess parent ratings of their adolescents' overall health and wellbeing using the PROMIS Parent Proxy Scale - Global Health 7. Parents will respond to 4 items (e.g., In general, would you say your child's quality of life is…; 5 = Excellent, 1 = Poor); 1 item (e.g., How often does your child feel really sad; 5 = Never; 1 = Always); and 2 items (e.g., How often does your child have fun with friends?; 5 = Always; 1 = Never). Responses were summed across the 7 items to create a single global health score. The scoring table in the PROMIS Global Health Scoring manual was used to convert a summed global health score into a T score value for each participant. The T score has a mean of 50 with a standard deviation of 10. Higher T scores on this measure represent greater adolescent overall health wellbeing as rated by their parent.

Participants will not have access to the online mindfulness intervention between the pre-test and post-test assessments. After completing the post-test questionnaires, participants in the wait-list control group will receive access to the online mindfulness intervention (Aware Program).

Total of all reporting groups

The overall sample includes parents and adolescents. The adolescent sex/gender categories only include adolescents and the parent sex/gender categories only include parents.

The overall sample includes parents and adolescents. The adolescent ethnicity categories include only adolescents and the parent ethnicity categories include only parents.

The overall sample includes parents and adolescents. The adolescent race categories include only adolescents and the parent race categories include only parents.

The overall sample includes parents and adolescents. This item only asked about the adolescents' psychological diagnosis.

The overall sample includes parents and adolescents. This item only asked about the parents' education.

Participants will not have access to the online mindfulness intervention between the pre-test and post-test assessments. After completing the post-test questionnaires, participants in the wait-list control group will receive access to the online mindfulness intervention (Aware Program).

Adolescents will be asked to respond to 10 questions (e.g., I keep my emotions to myself; 1 = Strongly disagree; 7 = Strongly agree) that assess their use of two emotion regulation strategies: Cognitive Reappraisal and Suppression. Responses will be averaged across each strategy and the minimum scale is 1 and the maximum scale score is 7. Higher scores indicate greater use of the emotion regulation strategy.

Adolescents will be asked to respond to 27 questions (e.g., I can tell when my feelings change; 1 = Not confident at all; 5 = Very confident) that assess their beliefs about their ability to understand and manage emotions. The measure has four factors: Using and managing your own emotions; Identifying and understanding your own emotions; Dealing with emotions in others; Perceiving emotion through facial expressions and body language. Responses will be averaged across the four factors and the minimum scale score is 1 and the maximum scale score is 5. Higher scores indicate greater emotional self-efficacy.

Adolescents will be asked to respond to 7 items that assess general anxiety (e.g., Over the last two weeks, how often have you been bothered by the following problems… feeling nervous, anxious, or on edge; 0 = Not at all, 1 = Several days, 2 = More than half the days, 3 = Nearly every day). Responses will be summed across the 7 items and the minimum scale score is 0 and the maximum scale score is 21. Higher scores indicate greater general anxiety.

Missing data from two adolescents

Adolescents will be asked to respond to 18 items (e.g., It's hard for me to ask others to do things with me; 1 = Not at all; 5 = All the time) that assess social anxiety. The measure has three factors: Fear of Negative Evaluation, Social Avoidance and Distress-New; Social Avoidance and Distress. Responses will be summed across each of the three factors. The minimum scale score is 1 and the maximum scale score is 40. Higher scores indicate greater social anxiety.

Adolescents will be asked to respond to a total of 7 items that assess their overall health and wellbeing using the PROMIS Pediatric Scale - Global Health 7 measure. Adolescents will respond to 4 items (e.g., In general, would you say your quality of life is…; 5 = Excellent, 1 = Poor); 1 item (e.g., How often do you feel really sad; 5 = Never; 1 = Always); and 2 items (e.g., How often do you have fun with friends?; 5 = Always; 1 = Never). Responses were summed across the 7 items to create a single global health score. The scoring table in the PROMIS Global Health Scoring manual was used to convert a summed global health score into a T score value for each participant. The T score has a mean of 50 with a standard deviation of 10. Higher T scores on this measure represent greater adolescent overall health and wellbeing.

All 7 items in this measure had to be answered in order to produce a valid global health T score. If a participant did not answer all 7 questions, no score was included in the dataset. Thus, 4 participants were excluded from the analysis of this measure.

Parents will be asked to respond to 24 questions (e.g., Responds positively to neutral or friendly overtures by peers; 1= Never; 4 = Always) that assess parent ratings of their adolescents' emotion regulatory abilities. There are two subscales for this measure: Emotion Regulation and Negativity. Responses will be averaged across the two subscales and the minimum scale score is 1 and the maximum scale score is 4. Higher scores indicate greater use of the emotion regulation strategy.

Parents will be asked to respond to 24 questions (e.g., Has difficulty thinking ahead or learning from experience; 1 = Definitely not true; 5 = Definitely true) that assess parent ratings of their adolescents' executive functioning. There are four subscales: Working Memory, Planning, Inhibition, and Regulation. Responses will be averaged across the four subscales and the minimum scale score is 1 and the maximum scale score is 5. Higher scores indicate greater executive functioning deficit.

Parents will be asked to respond to 8 questions (e.g., My child worries about things; 0 = Never; 3 = Always) that assess parent ratings of their adolescents' anxiety. Responses will be summed across the 8 items and the minimum scale score is 0 and the maximum scale score is 24. Higher scores indicate greater anxiety.

Parents will be asked to respond to a total of 7 items that assess parent ratings of their adolescents' overall health and wellbeing using the PROMIS Parent Proxy Scale - Global Health 7. Parents will respond to 4 items (e.g., In general, would you say your child's quality of life is…; 5 = Excellent, 1 = Poor); 1 item (e.g., How often does your child feel really sad; 5 = Never; 1 = Always); and 2 items (e.g., How often does your child have fun with friends?; 5 = Always; 1 = Never). Responses were summed across the 7 items to create a single global health score. The scoring table in the PROMIS Global Health Scoring manual was used to convert a summed global health score into a T score value for each participant. The T score has a mean of 50 with a standard deviation of 10. Higher T scores on this measure represent greater adolescent overall health wellbeing as rated by their parent.

Participants will not have access to the online mindfulness intervention between the pre-test and post-test assessments. After completing the post-test questionnaires, participants in the wait-list control group will receive access to the online mindfulness intervention (Aware Program).

This is for subscale: Deal with emotions of others

This is for subscale: Perceive emotions through faces and bodies

This is for subscale: social avoidance and distress (general)

This is for subscale: Inhibit

This is for subscale: Regulation