Table 1.

Baseline characteristics according to JNC-7 BP category in 158,365 CHEFS participants, China 1991 to 2000a

Baseline CharacteristicsbJNC-7 Classification of BPP
Normal(n = 60,432)Prehypertension(n = 54,654)Stage 1(n = 24,493)Stage 2(n = 18,786)
Age (yr)52.5 (9.4)55.5 (10.5)59.3 (10.9)61.7 (10.7)<0.001
Male (%)46.653.051.445.6<0.001
Living in northern China (%)51.863.466.966.7<0.001
Urban residence (%)49.758.663.965.9<0.001
High school graduate (%)21.825.624.420.7<0.001
Alcohol drinkers (%)18.021.821.818.6<0.001
Current cigarette smokers (%)31.735.033.028.7<0.001
Physical activity (%)c
    low30.735.041.347.4<0.001
    moderate19.824.728.129.3<0.001
    heavy49.540.430.623.2<0.001
BMI (kg/m2)21.5 (3.2)22.7 (3.5)23.5 (3.9)24.1 (4.2)<0.001
Overweight (%)d13.324.233.440.2<0.001
Systolic BP (mmHg)106.7 (8.2)126.1 (7.3)143.3 (9.3)167.6 (21.1)<0.001
Diastolic BP (mmHg)67.8 (6.7)78.0 (6.9)85.8 (8.5)94.5 (13.3)<0.001
Pulse BP (mmHg)38.9 (7.4)48.1 (10.1)57.5 (13.9)73.1 (21.6)<0.001
History of Stroke (%)0.40.92.36.5<0.001
History of CHD (%)0.61.42.53.9<0.001
  • a BP was categorized according to Seventh Report of the Joint National Committee on Prevention, Detection, Evaluation, and Treatment of High Blood Pressure (JNC-7) guidelines: Normal: systolic BP (SBP) <120 mmHg and diastolic BP (DBP) <80 mmHg; prehypertension: SBP 120 to 139 mmHg or DBP 80 to 89 mmHg; stage 1 hypertension: SBP 140 to 159 mmHg or DBP 90 to 99 mmHg; stage 2 hypertension: SBP ≥160 mmHg or SBP ≥100 mmHg or use of antihypertensive medications. BMI, body mass index; CHD, coronary heart disease; CHEFS, China National Hypertension Survey Epidemiology Follow-Up Study.

  • b All data are means (SD) or proportion.

  • c Physical activity was assessed on the basis of participants’ work-related activity only.

  • d BMI ≥25.0 kg/m2