Table 4.

The nonlinear impact of mask imports.

Recovery rate	(1)	(2)	(3)	(4)	(5)	(6)
Increase rate	0.003∗∗∗	0.004∗∗∗	0.004∗∗∗	0.005∗∗∗	0.004∗∗∗	0.005∗∗∗
	(0.001)	(0.001)	(0.002)	(0.002)	(0.002)	(0.002)
Increase rate2	−0.000∗∗∗	−0.000∗∗∗	−0.000∗∗∗	−0.000∗∗∗	−0.000∗∗∗	−0.000∗∗∗
	(0.000)	(0.000)	(0.000)	(0.000)	(0.000)	(0.000)
Log (per GDP)		3.060∗∗∗	3.047∗	3.055∗	2.726	1.429
		(1.004)	(1.784)	(1.797)	(1.860)	(2.324)
Infant mortality			−0.006	−0.009	−0.019	0.084
			(0.118)	(0.116)	(0.118)	(0.211)
Log (population density)				−0.223	−0.285	0.369
				(0.803)	(0.813)	(1.179)
Log (population)					−0.590	−0.140
					(0.572)	(0.858)
Education level						0.135∗
						(0.080)
Obs.	180	176	173	173	173	114
R-squared	0.022	0.086	0.085	0.085	0.088	0.074

^∗ Significant at 10%. ^∗∗∗Significant at 5%. ^∗∗∗Significant at 1%.