Do Public-Private Partnerships Improve the Operational Efficiency of Infrastructure in Mainland China?

Table 3

Descriptive statistics of variables.

Variable	National		Eastern		Central		Western
	Mean	SD	Mean	SD	Mean	SD	Mean	SD
Concession (−)	0.463	0.351	0.624	0.322	0.409	0.285	0.357	0.371
IE (no)	7.203	2.049	9.072	1.375	7.095	0.909	5.581	1.723
PGDP (CNY)	59323	25473	85059	24142	45700	7944	45802	14737
Competition (km/km^2)	0.028	0.020	0.045	0.024	0.026	0.006	0.014	0.008
Scale (km/km^2)	0.037	0.024	0.059	0.025	0.030	0.009	0.021	0.013