Among participants in the Corrie Digital Health group, a nine-item five-point Likert scale for assessing in-hospital care satisfaction 3 days post-discharge is used with scoring from 1 "strongly disagree" to 5 "strongly agree", with higher scores meaning participants were more satisfied with the care received. A total score of these nine items is calculated with possible total scores ranging from 9 to 45.

Among participants in the Corrie Digital Health group, a nine-item five-point Likert scale for assessing in-hospital care satisfaction 3 days post-discharge is used with scoring from 1 "strongly disagree" to 5 "strongly agree", with higher scores meaning participants were more satisfied with the care received. A total score of these nine items is calculated with possible total scores ranging from 9 to 45.

Among participants in the Corrie Digital Health group, one additional item, not on the five-point Likert scale, for assessing in-hospital care satisfaction 3 days post-discharge asked if they received information in writing about what symptoms or health problems to look out for after leaving the hospital (Yes/No).

Among participants in the Corrie Digital Health group, one additional item, not on the five-point Likert scale, for assessing in-hospital care satisfaction 3 days post-discharge asked them to provide an overall hospital rating on a 1-10 sliding scale with a higher score indicating a higher overall hospital rating.

Among participants in the Corrie Digital Health group, a 10-item five-point Likert scale for assessing systems usability of Corrie both 3 and 30 days post-discharge is used with scoring from 0 to 4 and higher scores meaning patients perceive the system as having global usability. The total score reference range is from 0 to 100, where lower scores indicate lower perceived application usability.

Among participants in the Corrie Digital Health group, a five-item five-point Likert scale for assessing participant satisfaction with Corrie as a tool to improve acute myocardial infarction recovery 3 and 30 days post-discharge is used with scoring from 1 to 5 and higher scores meaning more satisfaction with Corrie. Total possible scores ranging from 5 to 25, where higher scores indicate greater Corrie app satisfaction.

Among participants in the Corrie Digital Health group, a 29-item five-point Likert scale for assessing the subjective experience of user engagement with Corrie 30 days post discharge is used with scoring ranging from 1 to 5 and higher scores reflecting higher perceived user engagement. The total subjective user engagement score was calculated by diving the sum of all items by 29, resulting in a range of potential total scores from 1 to 5.

The total number of app interactions is a behavioral manifestation of user engagement and is monitored through app usage data. The total number of app interactions consisted of: number of BP, heart rate,weight, mood, and step count recordings; number of medications tracked; and number of educational articles and videos viewed over the study period.

The overall amount of time (days) spent using the app is a behavioral manifestation of user engagement and is monitored through app usage data and collected via Corrie Health Platform app user analytics.

Among participants in the Corrie Digital Health group, the 10-item five-point Likert scale for assessing patient activation 3 and 30 days post-discharge is used with scoring ranging from 1 to 5 and higher scores indicating the patient possesses the necessary knowledge, skills, and confidence needed for self-care. The total score reference range is from 0 to 100, where lower scores indicate lower patient activation.

Among participants in the Corrie Digital Health group, the eight-item four-point Likert scale for assessing cardiac medication adherence 30 days post-discharge is used with scoring ranging from 1 to 4 and lower scores indicating better adherence. Total possible scores could range from 8 to 32 with lower scores indicating better adherence. The total cardiac medication adherence score was dichotomized into completely cardiac medication adherent and near completely cardiac medication adherent, based on the median score.

Cardiac medication adherence (beta-blockers, anti-platelets, statins) is measured from the smartphone app usage data as the percentage of cardiac medications marked as "taken".

Medication adherence is measured from the smartwatch app usage data as percent of pills marked as taken.

Number of participants who had Emergency department visits (at Johns Hopkins Hospital and Johns Hopkins Bayview Medical Center) within 30-days post hospital discharge, that did not result in readmission, in the Corrie Digital Health Group as compared to the Historical Standard of Care Comparison group, collected from hospital administrative databases.

Number of hospital observations within 30-days post hospital discharge in the Corrie Digital Health Group as compared to the Historical Standard of Care Comparison group, collected from hospital administrative databases.

Among participants in the Corrie Digital Health group, the investigators are querying participants in the surveys sent out 30 days post-discharge as to whether participants attended an appointment with a primary care provider, cardiologist, and/or cardiac rehab. A point is given to each appointment attended with scores raging from 0 to 3.

Number of readmitted participants who had Recurrent myocardial infarctions in the Corrie Digital Health Group. Participants who had an all-cause 30-day readmission in the Corrie group, as identified by hospital administrative datasets, underwent further chart review to determine if the cause of readmission was a recurrent myocardial infarction.

Death within 30-days post hospital discharge in the Corrie Digital Health Group as compared to the Historical Standard of Care Comparison group, collected from hospital administrative databases.

Total of all reporting groups

In historical comparison group a primary payer for insurance of "Workers compensation/unknown" considered as "unknown".

26.6% missing body mass index data for historical control group

13.2% (114/864) of the participants in the historical comparison group had missing data for smoking status.

Unweighted, Agency for Healthcare Research and Quality Elixhauser comorbidity count includes 29 comorbidities with no imputation for missing values. 2.5% missing data for the Corrie intervention group and 1.9% missing data for the historical comparison group.

31% missing data for formal education in the Corrie group. This data is not available in the electronic medical record so it could not be obtained for the historical comparison group.

54.5% missing data on household income for the Corrie intervention group. This data is not available in the electronic medical record so it could not be obtained for the historical comparison group.

We estimated typical costs associated with readmissions or death of acute myocardial infarction (AMI) patients discharged with standard practices using 2014 US hospital costs from the Agency for Healthcare Research and Quality (AHRQ). The hospital cost (in US dollars) for unplanned 30-day readmission is presented for the Corrie Digital Health Platform Group and the Historical Comparison Group. The reported number is the estimated cost per readmission per participant since the exact cost of the readmission for each patient who was readmitted within 30-days wasn't available. No measure of central tendency is available.

200 patients enrolled in the Corrie group as compared to data from the historical comparison group as well as model estimates obtained from the literature for the standard of care comparison. Model estimates from the literature were used to supplement information when data was not available from the historical comparison group. The addition of the model estimates from the literature ensured the testing of representative, real-world values.

Among participants in the Corrie Digital Health group, a nine-item five-point Likert scale for assessing in-hospital care satisfaction 3 days post-discharge is used with scoring from 1 "strongly disagree" to 5 "strongly agree", with higher scores meaning participants were more satisfied with the care received. A total score of these nine items is calculated with possible total scores ranging from 9 to 45.

89 participants completed all the items on the survey, except for one where one person did not fill out the item/question, resulting in 88 being analyzed for that item.

Among participants in the Corrie Digital Health group, a nine-item five-point Likert scale for assessing in-hospital care satisfaction 3 days post-discharge is used with scoring from 1 "strongly disagree" to 5 "strongly agree", with higher scores meaning participants were more satisfied with the care received. A total score of these nine items is calculated with possible total scores ranging from 9 to 45.

89 participants completed the items on the survey.

Among participants in the Corrie Digital Health group, one additional item, not on the five-point Likert scale, for assessing in-hospital care satisfaction 3 days post-discharge asked if they received information in writing about what symptoms or health problems to look out for after leaving the hospital (Yes/No).

88 participants completed this item on the survey.

Among participants in the Corrie Digital Health group, one additional item, not on the five-point Likert scale, for assessing in-hospital care satisfaction 3 days post-discharge asked them to provide an overall hospital rating on a 1-10 sliding scale with a higher score indicating a higher overall hospital rating.

68 participants completed this item on the survey.

Among participants in the Corrie Digital Health group, a 10-item five-point Likert scale for assessing systems usability of Corrie both 3 and 30 days post-discharge is used with scoring from 0 to 4 and higher scores meaning patients perceive the system as having global usability. The total score reference range is from 0 to 100, where lower scores indicate lower perceived application usability.

At 3 days post discharge, 87 participants completed the survey, while at 30 days post-discharge 104 participants completed the survey.

Among participants in the Corrie Digital Health group, a five-item five-point Likert scale for assessing participant satisfaction with Corrie as a tool to improve acute myocardial infarction recovery 3 and 30 days post-discharge is used with scoring from 1 to 5 and higher scores meaning more satisfaction with Corrie. Total possible scores ranging from 5 to 25, where higher scores indicate greater Corrie app satisfaction.

80 participants completed the survey at 3 days post-discharge and 99 completed the survey at 30 days post-discharge.

Among participants in the Corrie Digital Health group, a 29-item five-point Likert scale for assessing the subjective experience of user engagement with Corrie 30 days post discharge is used with scoring ranging from 1 to 5 and higher scores reflecting higher perceived user engagement. The total subjective user engagement score was calculated by diving the sum of all items by 29, resulting in a range of potential total scores from 1 to 5.

102 participants completed the survey at 30 days post-discharge

The total number of app interactions is a behavioral manifestation of user engagement and is monitored through app usage data. The total number of app interactions consisted of: number of BP, heart rate,weight, mood, and step count recordings; number of medications tracked; and number of educational articles and videos viewed over the study period.

Following deployment of Corrie backend capabilities (the Corrie backend was not set up to capture application interactions for the first 34 participants enrolled), 83% (138/166) of Corrie users had captured application interactions (i.e. used the Corrie platform at least once over the 30-day study and subsequently connected to WiFi or cellular data to connect with the backend).

The overall amount of time (days) spent using the app is a behavioral manifestation of user engagement and is monitored through app usage data and collected via Corrie Health Platform app user analytics.

Following deployment of Corrie backend capabilities (the Corrie backend was not set up to capture application interactions for the first 34 participants enrolled), 83% (138/166) of Corrie users had captured application interactions (i.e. used the Corrie platform at least once over the 30-day study and subsequently connected to WiFi or cellular data to connect with the backend).

Among participants in the Corrie Digital Health group, the 10-item five-point Likert scale for assessing patient activation 3 and 30 days post-discharge is used with scoring ranging from 1 to 5 and higher scores indicating the patient possesses the necessary knowledge, skills, and confidence needed for self-care. The total score reference range is from 0 to 100, where lower scores indicate lower patient activation.

At 3-days post discharge only 94 participants completed the survey while at 30 days post-discharge 103 participants completed the survey.

Among participants in the Corrie Digital Health group, the eight-item four-point Likert scale for assessing cardiac medication adherence 30 days post-discharge is used with scoring ranging from 1 to 4 and lower scores indicating better adherence. Total possible scores could range from 8 to 32 with lower scores indicating better adherence. The total cardiac medication adherence score was dichotomized into completely cardiac medication adherent and near completely cardiac medication adherent, based on the median score.

102 participants completed the survey at 30 days post-discharge.

Cardiac medication adherence (beta-blockers, anti-platelets, statins) is measured from the smartphone app usage data as the percentage of cardiac medications marked as "taken".

135 patients who had app interaction data specific to cardiovascular disease (CVD) medications (beta-blocker, anti-platelet, statin) from admission through 30 days post-discharge.

Medication adherence is measured from the smartwatch app usage data as percent of pills marked as taken.

Unable to differentiate smartwatch app usage data from smartphone app usage data. Thus, results assessing medication adherence by smartwatch app is provided under as "assessed by smartphone app usage data" (Outcome 13).

Number of participants who had Emergency department visits (at Johns Hopkins Hospital and Johns Hopkins Bayview Medical Center) within 30-days post hospital discharge, that did not result in readmission, in the Corrie Digital Health Group as compared to the Historical Standard of Care Comparison group, collected from hospital administrative databases.

908 patients were enrolled at Johns Hopkins Hospital and Johns Hopkins Bayview Medical Center across both the Corrie intervention group (n=174) and historical comparison group (n=734). 80 of the patients had an emergency department visit within 30-days of discharge that resulted in a readmission and were excluded from this analysis. Hence, a total of 828 participants were included in the analysis across the Corrie intervention group (n=164) and the historical comparison group (n=664).

Number of hospital observations within 30-days post hospital discharge in the Corrie Digital Health Group as compared to the Historical Standard of Care Comparison group, collected from hospital administrative databases.

Unable to obtain this data from hospital administrative data sets. Data was not collected.

Among participants in the Corrie Digital Health group, the investigators are querying participants in the surveys sent out 30 days post-discharge as to whether participants attended an appointment with a primary care provider, cardiologist, and/or cardiac rehab. A point is given to each appointment attended with scores raging from 0 to 3.

104 participants completed this survey question at 30 days post-discharge.

Number of readmitted participants who had Recurrent myocardial infarctions in the Corrie Digital Health Group. Participants who had an all-cause 30-day readmission in the Corrie group, as identified by hospital administrative datasets, underwent further chart review to determine if the cause of readmission was a recurrent myocardial infarction.

Total of 13 participants in the Corrie group who were readmitted within 30 days of discharge. Unable to obtain reason for readmission from the hospital administrative data sets. Thus, data on whether 30-day readmissions were due to recurrent myocardial infarction were not available for the historical comparison group. Chart review, to obtain this reason for readmission as done with the Corrie group, was not possible for the historical comparison group.

Death within 30-days post hospital discharge in the Corrie Digital Health Group as compared to the Historical Standard of Care Comparison group, collected from hospital administrative databases.

Unable to obtain data from hospital administrative data sets. Data was not collected.