Table 1 General Characteristics of WCA by CHNS Rounds, 1991–20,151−2
Characteristic | 1991 | 2004 | 2015 | P-value |
|---|---|---|---|---|
Sample(N) | 3730 | 2866 | 3623 | - |
Education level (%) | ||||
Primary school/below | 51.6 (0.8) | 35.2 (0.9) | 18.1 (0.7) | < 0.001 |
Middle school | 32.1(0.8) | 36.1(0.9) | 37.4(0.9) | |
High school/above | 16.3 (0.6) | 28.7(0.8) | 44.5 (0.9)) | |
Marital status (%) | ||||
Single | 23.8(0.7) | 14.2(0.7) | 11.50.6) | < 0.001 |
Married | 76.2(0.7) | 85.8(0.7) | 88.5(0.6) | |
Income (1k yuan) | 3.8 (0.1) | 8.9 (0.2) | 44.8 (1.4) | < 0.001 |
BMI (kg/m2) | 21.8(0.1) | 22.8(0.1) | 23.5 (0.1) | < 0.001 |
PA(METs/w) | 462.6 (4.6) | 246.0(4.0) | 166.6(2.8) | < 0.001 |
Smoking (%) | 2.0(0.1) | 2.7(0.1) | 3.0 (0.1) | 0.507 |
Drinking (%) | 12.0 (0.6) | 9.3(0.7) | 7.2(0.7) | < 0.001 |
Region (%) | ||||
Urban | 14.1(0.6) | 13.9(0.6) | 22.9 (0.7) | < 0.001 |
Rural | 85.9(0.6) | 86.1(0.6) | 77.1(0.7) | |
District (%) | ||||
Eastern | 35.8(0.8) | 44.7(0.9) | 46.0(1.0) | < 0.001 |
Central | 38.2(0.8) | 33.3(0.9) | 26.0(0.8) | |
Western | 26.0(0.7) | 22.0(0.8) | 28.0(0.9) |