Table 1 The definition of urban–rural continuum
From: Urban–rural disparity in the relationship between ambient air pollution and preterm birth
Code | Category | jiedao | zhen | xiang |
|---|---|---|---|---|
110 | District | City proper | Suburb | |
120 | Township | |||
121 | County town | County town | ||
122 | General town | General town | ||
200 | Countryside | Countryside |