Table 2.
Demographics Described Separately for Participants Recruited as Normotensive or Prehypertensive
| Variable | Normotensive (n=49) | Prehypertensive (n=178) |
|---|---|---|
| Age, y | 47.1 (7.0) | 48.6 (7.0) |
| Education, years | 15.4 (3.0) | 15.3 (2.8) |
| Sex (% male) | 39 | 47 |
| Race (% white)a | 65 | 63 |
| SBP, mm Hgb | 108.2 (6.8) | 123.4 (6.8) |
| DBP, mm Hgb | 71.1 (5.2) | 81.3 (5.1) |
| Heart rate, beats/min | 69.5 (9.2) | 71.0 (9.1) |
| Mean SBP task, control, mm Hg | 2.5 (3.6) | 2.2 (4.0) |
| BMIb | 26.3 (4.9) | 29.7 (5.9) |
| Drink alcohol, % | 80 | 72 |
| Smoke, % | 20 | 27 |
| Taking prescription medications, % | 16 | 29 |
| Average number of reported medical/psychiatric conditionsb | 0.53 (0.77) | 1.12 (1.3) |
| Physical activity estimated, kcal | 1625 (1637) | 1877 (1767) |
| Apnea risk (% by Berlin questionnaire)b | 6.1 | 21.9 |
| Urinary sodium, mmol/L | 113.9 (58.9) | 106.8 (58.8) |
| Urinary potassium, mmol/L | 36.6 (21.2) | 31.8 (19.4) |
| Estimate intelligence quotient (NART) | 108.8 (10.6) | 108.6 (11.9) |
| White matter hyperintensity rating, periventricular | 1.54 (0.85) | 1.70 (0.88) |
| White matter hyperintensity rating, brainstem | 1.12 (1.13) | 1.38 (1.25) |
| APOE*E4 carrier, %b | 16 | 31 |
| Total CBF, mL/min/100 mL | 74.3 (12.9) | 71.5 (13.5) |
Data are shown as mean (SD) or percentage. Sample size varies slightly among variables because of, for example, failures in blood sampling, incomplete urine collection, and refusal to answer. Variation is between 47 and 49 for normotensive and 159 and 178 for prehypertensive participants. BMI indicates body mass index; CBF, cerebral blood flow; DBP, diastolic blood pressure; NART, National Adult Reading Test; SBP, systolic blood pressure.
Overall, 77 were black and 7 were Asian or Hispanic. Physical activity and white matter indices were transformed for purpose of analyses, but the original values are presented.
A descriptive statistical difference with a t test or χ2 test between prehypertensive and normotensive groups.