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