Table 1.
Sample characteristics (weighted) by survey wave. Values are percentages (95% CI) unless stated otherwise.
| Characteristics | 2007 | 2017 | P for difference |
|---|---|---|---|
| No. of participants | 45956 | 72824 | |
| Mean age at survey (standard error), years | 44.8 (0.14) | 43.8 (0.42) | 0.02 |
| Sex | |||
| Men | 49.4 (49.3 to 49.5) | 50.2 (49.9 to 50.5) | |
| Women | 50.6 (50.5 to 50.7) | 49.8 (49.5 to 50.2) | 0.0001 |
| Urbanization | |||
| Urban | 45.8 (18.6 to 75.8) | 52.1 (31.7 to 71.8) | |
| Rural | 54.2 (24.3 to 81.4) | 47.9 (28.2 to 68.3) | 0.75 |
| Ethnicity | |||
| Han | 86.4 (69.2 to 94.7) | 95.6 (93.9 to 96.8) | |
| Non-Han | 13.6 (5.3 to 30.8) | 4.4 (32 to 6.1) | 0.14 |
| Income per year | |||
| ≤30000 yuan | 82.8 (77.7 to 87.0) | 44.7 (38.0 to 51.5) | |
| >30000 yuan | 17.2 (13.0 to 22.4) | 55.3 (48.5 to 62.0) | <0.0001 |
| Education | |||
| Less than college | 79.6 (72.5 to 85.2) | 66.2 (59.1 to 72.7) | |
| College and above | 20.4 (14.8 to 27.5) | 33.8 (27.3 to 40.9) | 0.006 |
| Current cigarette smoker | 26.1 (23.5 to 28.8) | 26.7 (25.4 to 27.9) | 0.69 |
| Physical examination, mean (standard error) | |||
| Mean body mass index, kg/m2 | 23.7 (0.17) | 24.1 (0.06) | 0.04 |
| Mean waist circumference, cm | 80.7 (0.58) | 83.5 (0.37) | 0.0002 |
| Mean systolic blood pressure, mm Hg | 121.7 (0.79) | 126.6 (0.67) | <0.0001 |
| Mean diastolic blood pressure, mm Hg | 77.5 (0.61) | 78.6 (0.57) | 0.23 |