Evolution of the Efficiency of Nationwide Commercial Banks in China Based on an SBM-Undesirable Model and DEA Window Analysis

Table 1

The descriptive statistics of the input and output indexes (unit: million yuan).

Index types	Variable	Mean	Std. dev.	Min	Max
Input	Net fixed assets	54840.94	62502.03	1674.92	220651
	Business and management fees	60901.08	53907.95	5223.87	179992
	Total deposits	4983279	4872905	360514	19226349
Output	Net interest income	151175.6	139631.2	12597.89	522078
	Noninterest income	49565.41	50388.75	1322.45	204424
	Nonperforming loans	50064.08	54807.68	1900	230834