Table 5.

The balance test.

variables	matching status	Mean				t-test
		treatment group	control group	Deviation rate (%)	Deviation reduction ratio (%)	t	P
InduStru	before matching	7.97	7.54	22.10	92.90	5.03	0
	after matching	7.97	7.94	1.60		0.27	0.76
Econ	before matching	3.86	3.85	4.30	−202.40	0.89	0.37
	after matching	3.86	3.84	12.90		2.35	0.02
Sci	before matching	−4.30	−4.77	54.60	87.20	12.65	0
	after matching	−4.30	−4.36	7.00		1.27	0.20
Edu	before matching	−1.72	−1.70	−7.70	−39.00	−1.68	0.09
	after matching	−1.72	−1.70	−10.70		−1.94	0.05
Temp	before matching	4.97	4.89	15.80	59.30	3.41	0
	after matching	4.97	5.05	−6.40		−1.19	0.23
Wind	before matching	3.19	3.20	−0.70	−339.50	−0.15	0.88
	after matching	3.19	3.18	3.20		0.60	0.54
Hum	before matching	4.30	4.25	29.30	69.00	6.02	0
	after matching	4.30	4.32	−9.10		−1.57	0.12
Invest	before matching	3.78	2.87	57.90	94.20	13.09	0
	after matching	3.78	3.85	−3.30		−0.59	0.55