Table 2. The summary of correlation tests between Variable 1 (individual’ acoustic coefficients) and Variable 2 (L2 proficiency)

Variable 1		Variable 2	Estimate	p-value
English	VOT coef.	L2 test scores	−0.37	.094
(/d/−/t/)	f0 coef.	L2 test scores	0.25	.27
Korean	VOT coef.	L2 test scores	−0.58	<.01
(/t/−/th/)	f0 coef.	L2 test scores	0.44	<.05