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. 2022 Jun 13;6(6):e34080. doi: 10.2196/34080

Table 1.

Baseline characteristics.

Variable Consented patients (N=110) Eligible patients (no consent) (N=797) P valuea
Hospital presentation randomization group, n (%) .62

Stable coronary artery disease 33 (30) 214 (26.8)

Unstable angina or non-STEMIb 57 (51.8) 409 (51.3)

STEMI 20 (18.2) 174 (21.8)
Sex, n (%) .06

Male 91 (82.7) 594 (74.5)

Female 19 (17.2) 203 (25.5)
Age (years)

At randomization .006


Value, mean (SD) 65.3 (9.0) 62.5 (11.0)


Value, median (IQR) 65 (47-87) 62 (28-95)

Men <.001


Value, mean (SD) 65.6 (8.9) 61.2 (10.5)


Value, median (IQR) 65 (47-87) 61 (28-95)

Women .38


Value, mean (SD) 64.1 (9.5) 66.3 (11.7)


Value, median (IQR) 65 (47-81) 68 (36-95)
Ethnicity, n (%) .19

White 99 (90) 657 (82.4)

Asian 3 (2.7) 27 (3.4)

African American 1 (0.9) 37 (4.6)

Hispanic or Latino 0 (0) 14 (1.7)

Other 7 (6.4) 62 (7.8)
Country, n (%) .61

Canada 23 (20.9) 184 (23.1)

United States 87 (79.1) 613 (76.9)
BMI (kg/m2), n (%) .18

<25 19 (17.3) 124 (15.6)

25-30 49 (44.5) 307 (38.5)

≥30 42 (38.2) 363 (45.5)
Diabetes, n (%) 21 (19.1) 237 (29.7) .02
Hypertension, n (%) 74 (67.2) 554 (69.5) .63
Dyslipidemia, n (%) 77 (70) 540 (67.8) .64
Any history of heart failure, n (%) 2 (1.8) 28 (3.5) .35
Heart failure >2 weeks, n (%) 1 (0.9) 24 (3) .21
Estimated glomerular filtration rate (modification of diet in renal disease) <60, n (%) 14 (12.7) 91 (11.4) .61
Cigarette use, n (%) 7 (6.4) 198 (24.8) <.001
History of myocardial infarction (excluding index event), n (%) 14 (12.7) 136 (17.1) .25
Peripheral artery disease, n (%) 3 (2.7) 33 (4.1) .48
History of percutaneous coronary intervention, n (%) 27 (24.5) 220 (27.6) .50
History of coronary artery bypass grafting, n (%) 11 (10) 75 (9.4) .84
Stroke or transient ischemic attack, n (%) 2 (1.8) 26 (3.3) .41
Family history of coronary artery disease, n (%) 61 (55.4) 413 (51.8) .48
Chronic lung disease, n (%) 4 (3.6) 42 (5.3) .46
Currently on dialysis, n (%) 0 (0) 1 (0.1) .71
Education and computer literacy form completed, n (%) <.001

Completed the form 106 (96.4) 637 (79.9)

Did not complete the form 4 (3.6) 160 (20.1)

Education level <.001


Less than high school 2 (1.9) 39 (6.1)


High school graduate or some college 25 (23.5) 274 (43)


Associate or bachelor’s degree 50 (47.2) 164 (25.7)


Graduate or PhD 25 (23.6) 75 (11.7)


Prefer not to answer 4 (3.8) 85 (13.4)

Frequency of internet use <.001


Does not use 2 (1.9) 76 (11.8)


About daily 96 (90.5) 397 (62.3)


About once a week 2 (1.9) 46 (7.2)


Occasionally (less than once a week) 5 (4.7) 44 (6.9)


Do not know 0 (0) 2 (0)


Prefer not to answer 1 (0.9) 72 (11.3)

Has a computer or laptop 95 (93) 423 (88) .17

Has a smartphone 99 (98) 404 (86) <.001

Has a tablet 45 (49) 204 (46) .63

Has a smart speaker 26 (31) 74 (19) .02

Has downloaded app to phone 93 (94) 326 (81) .006

aComparison of consented and nonconsented patients.

bSTEMI: ST-elevation myocardial infarction.