Table 2.

Balance test results of the propensity score matching method.

Variable		Mean Value		Standard Deviation (%)	Reduction in the Standard Deviation (%)	t-Test
		The Treatment Group	The Control Group			t Statistic	Associated Probability of the t-Test
lnpecp	Before the match	−2.7261	−3.1	42.1		52.90	0.000
	After the match	−2.7261	−2.7284	0.3	99.4	0.26	0.796
lntemp	Before the match	3.8746	3.8061	26.9		34.26	0.000
	After the match	3.8746	3.8794	−1.9	92.9	−1.91	0.056
lnslope	Before the match	0.7148	0.21309	27.6		37.80	0.000
	After the match	0.7148	0.70359	0.6	97.8	0.63	0.528
lnelev	Before the match	6.7748	6.7164	4.0		5.14	0.000
	After the match	6.7748	6.7708	0.3	93.2	0.28	0.781
lntourban	Before the match	10.333	10.392	−5.5		−6.58	0.000
	After the match	10.333	10.321	1.1	80.5	1.08	0.279
lntoroad	Before the match	9.9819	10.026	−3.7		−4.56	0.000
	After the match	9.9819	9.9951	−1.1	70.4	−1.11	0.265
lnlandcover	Before the match	0.80104	0.8439	−7.1		−8.70	0.000
	After the match	0.80104	0.80166	−0.1	98.6	−0.11	0.913

Note: lnpecp represents precipitation, lntemp represents temperature, lnslope represents the slope, lnelev represents elevation, lntourban represents the distance to urban land, lntoroad represents the distance to a road, and lnlandcover represents the landcover type.