Variable | Sample number | Mean value | Standard deviation | Minimum value | Maximum value |
Aggregate investment for industrial treatment/GDP | 510 | 68.8070 | 55.9838 | 3.82914 | 454.758 |
Investment for treating the industrial waste gas /GDP | 510 | 34.3727 | 43.7886 | 0.280720 | 605.125 |
Investment for treating the industrial waste water /GDP | 510 | 23.9365 | 22.0773 | 0.502613 | 192.493 |
Investment for treating the industrial solid wastes /GDP | 510 | 3.98703 | 5.83558 | 0.002268 | 55.0776 |
Degree of fiscal decentralization | 510 | 0.111760 | 0.072878 | 0.01102 | 0.410858 |
Economic development level | 510 | 1055.32 | 1206.72 | 21.272 | 7391.60 |
Industrial structure | 510 | 1.2454 | 0.304921 | 0.289987 | 2.02276 |
Intensity of competition between governments | 510 | 0.033333 | 0.046797 | 0.000101 | 0.257553 |
Degree of opening to the outside world | 510 | 0.3106758 | 0.394605 | 0.032045 | 1.72148 |
Population density | 510 | 407.8525 | 559.534 | 7.11047 | 3808.85 |