Table 1.
Characteristics of the Masked Hypertension Study, Improving the Detection of Hypertension Study and Jackson Heart Study participants.
| MHT Study (derivation cohort) |
IDH/JHS (pooled validation cohort) |
|
|---|---|---|
| (n=695) | (n=675) | |
| Age categories | ||
| < 40 years | 213 (30.7%) | 212 (31.4%) |
| 40 to 59 years | 435 (62.6%) | 324 (48.0%) |
| ≥ 60 years | 47 (6.8%) | 139 (20.6%) |
| Male | 275 (39.6%) | 241 (35.9%) |
| Black race | 47 (6.8%) | 5415 (61.5%) |
| Hispanic ethnicity | 87 (12.5%) | 216 (32.0%) |
| Body mass index, kg/m2 | 27.4 (5.4%) | 28.5 (6.0) |
| Diabetes | 25 (3.8%) | 37 (5.5%) |
| Current smoker | 49 (7.4%) | 62 (9.3%) |
| Clinic blood pressure | ||
| Systolic, mmHg | 113.8 (10.7) | 115.0 (11.8) |
| Diastolic, mmHg | 74.4 (7.5) | 74.3 (8.0) |
| Prehypertensiona | 277 (39.9%) | 320 (47.4%) |
| Upper range of prehypertensionb | 89 (12.8%) | 130 (19.3%) |
| Ambulatory blood pressure | ||
| Daytime period | ||
| Systolic, mmHg | 122.6 (10.1) | 118.6 (12.1) |
| Diastolic, mmHg | 77.2 (7.5) | 71.8 (9.4) |
| Masked daytime hypertensionc | 134 (19.3%) | 137 (20.3%) |
| Nighttime period | ||
| Systolic, mmHg | 106.2 (10.7) | 108.6 (11.1) |
| Diastolic, mmHg | 62.3 (7.9) | 63.5 (7.7) |
| Masked nocturnal hypertensiond | 139 (20.0%) | 222 (32.9%) |
| Masked daytimec and/or nocturnald hypertension | 210 (30.2%) | 254 (37.6%) |
Numbers in the table are number (percentage) or mean (standard deviation).
MHT: Masked Hypertension Study.
IDH: Improving the Detection of Hypertension Study.
JHS: Jackson Heart Study.
Prehypertension: Among adults with non-elevated clinic blood pressure (i.e., systolic blood pressure < 140 mmHg and diastolic blood pressure < 90 mmHg), clinic systolic blood pressure ≥ 120 mmHg and < 140 mmHg or clinic diastolic blood pressure ≥ 80 mmHg and < 90 mmHg.
Upper range of prehypertension: Among adults with non-elevated clinic blood pressure (i.e., systolic blood pressure < 140 mmHg and diastolic blood pressure < 90 mmHg), clinic systolic blood pressure ≥ 130 mmHg and < 140 mmHg or clinic diastolic blood pressure ≥ 85 mmHg and < 90 mmHg.
Masked daytime hypertension: Clinic systolic/diastolic blood pressure < 140/90 mmHg with mean ambulatory daytime systolic/diastolic blood pressure ≥ 135/85 mmHg.
Masked nocturnal hypertension: Clinic systolic blood pressure < 140/90 mmHg with mean ambulatory nocturnal systolic/diastolic blood pressure ≥ 120/70 mmHg.