Table 1 Demographic characteristics of sample and overweight and obesityprevalence
Group | Unweighted N | Unweighted % of sample | Weighted % of sample | Weighted overweight and obesity prevalence | Weighted OR (95% CI) |
|---|---|---|---|---|---|
Age (years) | Â | Â | Â | Â | Â |
 <20 | 1831 | 15.7 | 12.9 | 10.1 | 1.00 |
 20 | 2324 | 19.9 | 31.5 | 6.5 | 0.67 (0.43, 1.07) |
 21 | 2709 | 23.2 | 30.8 | 7.1 | 0.70 (0.34, 1.41) |
 22 | 2396 | 20.5 | 14.5 | 8.0 | 0.68 (0.38, 1.21) |
 23 and over | 2413 | 20.7 | 10.3 | 7.9 | 0.79 (0.47, 1.32) |
Gender | Â | Â | Â | Â | Â |
 Male | 4177 | 35.8 | 43.9 | 9.4 | 1.00 |
 Female | 7496 | 64.2 | 56.1 | 5.7 | 0.40 (0.27, 0.60)** |
Ethnicity | Â | Â | Â | Â | Â |
 Han | 10,884 | 93.2 | 94.6 | 7.6 | 1.00 |
 Minority | 789 | 6.7 | 5.4 | 6.9 | 0.90 (0.36, 2.26) |
Father’s occupation |  |  |  |  |  |
 Operation and commercial work | 9269 | 79.4 | 71.8 | 9.0 | 1.00 |
 Staff and administration | 1681 | 14.4 | 18.8 | 10.3 | 1.66 (0.79, 1.73) |
 Teacher, scientific and technical work | 723 | 6.2 | 9.4 | 11.8 | 1.16 (0.46, 2.97) |
Mother’s occupation |  |  |  |  |  |
 Operation and commercial work | 9397 | 80.5 | 72.4 | 8.9 | 1.00 |
 Staff and administration | 1500 | 12.9 | 16.6 | 10.1 | 1.18 (0.79, 1.73) |
 Teacher, scientific and technical work | 776 | 6.5 | 11.0 | 12.7 | 1.17 (0.45, 2.97) |
Income of each person in family (RMB) | Â | Â | Â | Â | Â |
 <10,000 | 1773 | 36.2 | 34.0 | 6.1 | 1.00 |
 10–19,999 | 1241 | 25.3 | 20.7 | 9.5 | 1.61 (1.19, 2.17)** |
 20,000 and over | 1888 | 38.5 | 45.3 | 8.1 | 1.35 (1.14, 1.59)** |
Monthly expenditures (RMB) | Â | Â | Â | Â | Â |
 <1000 | 1273 | 10.9 | 7.6 | 7.4 | 1.00 |
 1000–1499 | 6048 | 51.8 | 49.0 | 8.8 | 1.21 (0.67, 2.16) |
 1500–1999 | 3406 | 29.2 | 30.2 | 8.5 | 1.18 (0.60, 2.30) |
 2000 and over | 946 | 8.1 | 13.5 | 15.0 | 2.37 (1.39, 4.06)** |
Academic major | Â | Â | Â | Â | Â |
 Medical | 10,270 | 87.9 | 81.1 | 6.5 | 1.00 |
 Other | 1403 | 12.1 | 18.9 | 7.8 | 1.21 (0.93, 1.58) |
Smoking status | Â | Â | Â | Â | Â |
 Non-smoker | 10,735 | 92.0 | 87.3 | 8.9 | 1.00 |
 Occasional smoker | 706 | 6.1 | 8.9 | 10.7 | 1.22 (0.61, 2.43 |
 Daily smoker | 232 | 2.0 | 3.8 | 20.1 | 2.56 (1.33, 4.92)** |
Home region | Â | Â | Â | Â | Â |
 Northeast | 889 | 7.6 | 5.1 | 21.1 | 1.00 |
 North | 1785 | 15.2 | 14.4 | 15.3 | 0.67 (0.33, 1.37) |
 Eastern | 1784 | 15.3 | 17.0 | 11.1 | 0.47 (0.24, 0.93)* |
 Centre | 4968 | 42.6 | 39.2 | 7.4 | 0.30 (0.16, 0.55)** |
 Southwest | 959 | 8.2 | 16.3 | 7.7 | 0.31 (0.16, 0.60)** |
 Northwest | 1288 | 11.0 | 8.0 | 2.4 | 0.09 (0.03, 0.32)** |
Urban–rural home location |  |  |  |  |  |
 Countryside or township | 3276 | 67.0 | 59.6 | 4.3 | 1.00 |
 County town | 741 | 15.1 | 17.7 | 9.1 | 2.35 (1.10, 5.02)* |
 City | 876 | 17.9 | 22.8 | 15.5 | 5.22 (1.70, 16.3)** |
GDP of home province | Â | Â | Â | Â | Â |
 <50,000 | 5868 | 50.3 | 51.3 | 8.2 | 1.00 |
 50,000–99,000 | 3483 | 29.8 | 26.7 | 9.8 | 1.21 (0.81, 1.82) |
 100,000 and over | 2322 | 19.9 | 22.0 | 12.2 | 1.17 (1.05, 1.41)* |
Type of university | Â | Â | Â | Â | Â |
 High level | 4154 | 35.1 | 58.3 | 11.5 | 1.00 |
 Middle level | 6823 | 53.3 | 39.2 | 6.8 | 0.56 (0.43, 0.74)** |
 Lower level | 696 | 6.0 | 2.5 | 5.2 | 0.42 (0.34, 0.53)** |
University city GDP (per capita) | Â | Â | Â | Â | Â |
 <50,000 | 3986 | 34.1 | 16.0 | 7.1 | 1.00 |
 50,000–99,000 | 6221 | 53.3 | 60.7 | 8.9 | 1.28 (0.96, 1.72) |
 100,000 and over | 1466 | 12.6 | 23.3 | 12.8 | 1.94 (1.25, 3.00)** |
University city population (m) | Â | Â | Â | Â | Â |
 <1.0 | 3019 | 25.8 | 12.1 | 6.3 | 1.00 |
 1.0–3.9 | 5866 | 50.2 | 57.7 | 10.1 | 1.68 (1.11, 2.55)* |
 4 and over | 2788 | 23.9 | 30.2 | 9.8 | 1.62 (1.10, 2.40)* |