| 
 | (1) | (2) | (3) | (4) | (5) | 
| 变量名称 | 样本数 | 均值 | 标准差 | 最小值 | 最大值 | 
| Lnco2 | 182 | 6.112 | 0.514 | 4.955 | 7.307 | 
| lnisu | 182 | 6.375 | 0.190 | 5.892 | 6.824 | 
| lngdp | 182 | 10.56 | 0.555 | 9.319 | 11.99 | 
| lnei | 182 | −2.626 | 0.520 | −3.896 | −1.610 | 
| lnopen | 182 | 0.451 | 0.806 | −2.620 | 2.438 | 
| lnurban | 182 | 4.374 | 0.468 | 3.121 | 4.776 | 
| lntech | 182 | 2.368 | 0.248 | 1.552 | 2.827 |