The scale and structure of government financial investment in traditional medicine based on optimal efficiency: evidence from public traditional Chinese medicine hospitals (PTHs) of Henan province, China

Table 4 Unit root test results of variables (0.05)

Variable	Level test result		First-order difference result (D)		Second-order difference result (D2)
Variable	ADF result	Critical result	ADF result	Critical result	ADF result	Critical result
LN Y	1.7439	−1.9777	−0.4981	−1.9777	−3.9300	−1.9823
LN K	7.6575	−1.9740	−0.1238	−1.9823	−5.9347	−1.9823
LN L	4.9011	− 1.9740	− 1.2430	− 1.9777	−5.2242	− 1.9823
LN G	4.0416	− 1.9740	− 1.2776	− 1.9777	−2.8411	− 1.9823

ISSN: 1472-6963