Table 8.

Robustness test of the model.

Panel A: sensitivity analysis of the Three-stage DEA model
Variable/removed	Average scores	p value(Wilcoxon)	Cohen's d	Spearman rank correlation(sig.)
None	0.747	-	-	-
Number of health institutions	0.735	0.103	0.194	0.887 (0.000)
Number of beds	0.708	0.804	0.071	0.880 (0.000)
Number of health personnel	0.697	0.974	0.021	0.842 (0.000)
Urbanization rate	0.726	0.465	0.204	0.838 (0.000)
Government health expenditure	0.738	0.156	0.142	0.827 (0.000)
Panel B: the distribution variance of efficiency scores
Year	p -value(Wilcoxon)	Cohen's d	Spearman rank correlation (sig.)
(2012-2013)	0.809	0.003	0.936(0.000)
(2013-2014)	0.602	0.018	0.951(0.000)
(2014-2015)	0.388	0.065	0.927(0.000)
(2015-2016)	0.57	0.012	0.985(0.000)
(2016-2017)	0.43	0.051	0.984(0.000)
(2017-2018)	0.253	0.088	0.978(0.000)
(2018-2019)	0.102	0.114	0.974(0.000)
(2019-2020)	0.294	0.072	0.980(0.000)