Table 1.
Characteristics of Participants in the MHT, IDH, and JHS
| MHT Study (Derivation Cohort) | IDH/JHS (Pooled Validation Cohort) | |
|---|---|---|
| (n=695) | (n=675) | |
| Age categories, No. (%), y | ||
| <40 | 213 (30.7) | 212 (31.4) |
| 40–59 | 435 (62.6) | 324 (48.0) |
| ≥60 | 47 (6.8) | 139 (20.6) |
| Male, No. (%) | 275 (39.6) | 241 (35.9) |
| Black race, No. (%) | 47 (6.8) | 5415 (61.5) |
| Hispanic ethnicity, No. (%) | 87 (12.5) | 216 (32.0) |
| Body mass index, No. (%), kg/m2 | 27.4 (5.4) | 28.5 (6.0) |
| Diabetes, No. (%) | 25 (3.8) | 37 (5.5) |
| Current smoker, No. (%) | 49 (7.4) | 62 (9.3) |
| Clinic BP | ||
| Systolic, mm Hg | 113.8 (10.7) | 115.0 (11.8) |
| Diastolic, mm Hg | 74.4 (7.5) | 74.3 (8.0) |
| Prehypertension, No. (%)a | 277 (39.9) | 320 (47.4) |
| Upper range of prehypertension, No. (%)b | 89 (12.8) | 130 (19.3) |
| Ambulatory BP | ||
| Daytime period | ||
| Systolic, mm Hg | 122.6 (10.1) | 118.6 (12.1) |
| Diastolic, mm Hg | 77.2 (7.5) | 71.8 (9.4) |
| Masked daytime hypertension, No. (%)c | 134 (19.3) | 137 (20.3) |
| Nighttime period | ||
| Systolic, mm Hg | 106.2 (10.7) | 108.6 (11.1) |
| Diastolic, mm Hg | 62.3 (7.9) | 63.5 (7.7) |
| Masked nocturnal hypertension, No. (%)d | 139 (20.0) | 222 (32.9) |
| Masked daytimec and/or nocturnald hypertension, No. (%) | 210 (30.2) | 254 (37.6) |
Abbreviations: BP, blood pressure; IDH, Improving the Detection of Hypertension Study; JHS, Jackson Heart Study; MHT, Masked Hypertension Study. Values are expressed as mean (standard deviation) unless otherwise indicated.
aPrehypertension: among adults with nonelevated clinic blood pressure (BP) (ie, systolic BP <140 mm Hg and diastolic BP <90 mm Hg), clinic systolic BP ≥120 mm Hg and <140 mm Hg, or clinic diastolic BP ≥80 mm Hg and <90 mm Hg. bUpper range of prehypertension: among adults with nonelevated clinic BP (ie, systolic BP <140 mm Hg and diastolic BP <90 mm Hg), clinic systolic BP ≥130 mm Hg and <140 mm Hg, or clinic diastolic BP ≥85 mm Hg and <90 mm Hg. cMasked daytime hypertension: clinic systolic/diastolic BP <140/90 mm Hg with mean ambulatory daytime systolic/diastolic BP ≥135/85 mm Hg. dMasked nocturnal hypertension: clinic systolic BP <140/90 mm Hg with mean ambulatory nocturnal systolic/diastolic BP ≥120/70 mm Hg.