Table 1.
Numbers of cases and controls selected in each level of urbanization
| Case | Control | |||||||
|---|---|---|---|---|---|---|---|---|
| Urban | PU | Rural | Total | Urban | PU | Rural | Total | |
| All | 208 | 16 | 25 | 249 | 172 | 11 | 66 | 249 |
| Within 20 km | 208 | 16 | 6 | 230 | 172 | 11 | 5 | 188 |
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