Table 1.
Baseline characteristics of blood pressure and EKG cohorts, as well as all ambulatory care patients prior to eligibility screening.
| Characteristic | All ambulatory care patients (n = 631,216) | BP cohort (n = 48,204) | EKG cohort (n = 7270) |
|---|---|---|---|
| Demographic characteristics | |||
| Age, years, mean (SD) | 46.26 (20.65) | 54.87 (17.50) | 68.11 (15.77) |
| Age, ≥ 65 years, n (%) | 140,988 (22.3) | 15,397 (31.9) | 4517 (62.1) |
| Female, n (%) | 358,869 (56.9) | 29,011 (60.2) | 4015 (55.2) |
| Race/ethnicity, n (%) | |||
| Asian | 51,134 (8.1) | 4437 (9.2) | 483 (6.6) |
| Hispanic/Latinx | 75,291 (11.9) | 5322 (11.0) | 691 (9.5) |
| Non-Hispanic Black | 59,163 (9.4) | 6385 (13.2) | 1111 (15.3) |
| Non-Hispanic White | 357,461 (56.6) | 29,483 (61.2) | 4735 (65.1) |
| Othera | 28,359 (4.5) | 1423 (3.0) | 214 (2.9) |
| Smoking status, n (%) | |||
| Current | 39,683 (6.3) | 2266 (4.7) | 320 (4.4) |
| Former | 119,872 (19.0) | 14,011 (29.1) | 2832 (39.0) |
| Never | 410,407 (65.0) | 31,927 (66.2) | 4118 (56.6) |
| Clinical characteristics | |||
| Follow-up length, mean (SD), years | – | 2.45 (0.97) | 2.37 (1.03) |
| Follow-up length, median [IQR], years | – | 3.00 [2.36, 3.00] | 3.0 (2.0, 3.0) |
| Number of blood pressures recorded during study period, mean (SD) | 6.88 (11.17) | 15.39 (13.86) | 23.86 (18.38) |
| Number of blood pressures recorded during study period, median [IQR] | 3.00 [1.00, 8.00] | 12.00 [8.00, 18.00] | 19.0 [12.0, 30.0] |
| Diabetes mellitus, n (%) | – | 5721 (11.9) | 1409 (19.4) |
| Renal disease, n (%) | – | 3559 (7.4) | 1250 (17.2) |
| Atrial fibrillation or atrial flutter, n (%) | – | 3376 (7.0) | 1261 (17.3) |
| Coronary artery disease, n (%) | – | 5441 (11.3) | 1960 (27.0) |
| Metastatic malignancy, n (%) | – | 872 (1.8) | 318 (4.4) |
| Myocardial Infarction, n (%) | – | 1807 (3.7) | 814 (11.2) |
| Heart failure, n (%) | – | 4122 (8.6) | 1709 (23.5) |
| Stroke, n (%) | – | 2543 (5.3) | 851 (11.7) |
| Blood pressure characteristics | |||
| Antihypertensive use, n (%) | – | 13,539 (28.1) | 3351 (46.1) |
| Mean systolic blood pressure, mean (SD), mmHg | 122.69 (15.16) | 123.96 (12.09) | 126.99 (11.78) |
| Mean systolic blood pressure, median [IQR], mmHg | 121.67 [112.00, 132.00] | 123.43 [115.30, 131.80] | 127.0 [119.0, 134.0] |
| Mean diastolic blood pressure, mean (SD), mmHg | 74.03 (9.36) | 73.77 (7.18) | 72.97 (7.43) |
| Mean diastolic blood pressure, median [IQR], mmHg | 74.00 [68.00, 80.00] | 73.46 [68.81, 78.40] | 73.0 [68.0, 78.0] |
| Heart rate characteristics | |||
| Number of EKGs, mean (SD) | – | – | 2.74 (3.59) |
| Number of EKGs, median [IQR] | – | – | 2.0 [1.0, 3.0] |
| Heart rate, mean (SD) | – | – | 73.91 (24.18) |
| Heart rate, median [IQR] | – | – | 70.0 [62.0, 81.0] |
| Number of QRS complexes, mean (SD) | – | – | 10.76 (2.7) |
| Number of QRS complexes, median [IQR] | – | – | 10 [9, 12] |
aOther race includes American Indian/Alaska Native, Native Hawaiian or other Pacific Islander, and Other.
SD standard deviation, IQR interquartile range.