Table 1. Characteristics of the study samples.
| Characteristics | Beijing | Shanghai | All |
| Na (% men) | 1574(45.2) | 1636(43.5) | 3210(44.3) |
| Ageb (years) | 58.3±5.9 | 58.9±6.0 | 58.6±6.0 |
| BMIb (kg/m2) | 25.2±3.7 | 23.6±3.3 | 24.4±3.6 |
| SBPb (mmHg) | 147.5±24.4 | 138.6±23.8 | 143.0±24.5 |
| DBPb (mmHg) | 82.8±11.5 | 80.5±11.6 | 81.6±11.6 |
| hs-CRPc (mg/l) | 0.84(0.79, 0.89) | 0.60(0.56, 0.63) | 0.71(0.68, 0.73) |
| Normotensiona (%) | 182 (11.5) | 368 (22.5) | 550 (17.1) |
| Hypertensiona (%) | 977 (62.1) | 804 (49.1) | 1781 (55.5) |
| Taking antihypertensivea (%) | 436 (27.7) | 461 (28.2) | 897 (27.9) |
Values are expressed as anumber (percentage), bmeans ± SD or cgeometric mean (95%CI). BMI indicates body mass index, SBP indicates systolic blood pressure DBP indicates diastolic blood pressure, hs-CRP indicates high-sensitivity C-reactive protein.