Table 6. Linear mixed effect models results of the preceding vowel durations in the Korean group

Classification	Est.	SE	df	t-value	Pr (>|t|)
(Intercept)	63.0	3.71	37	16.98	<2e–16***
un-	19.78	3.74	358	5.302	2.22e–07***
-ness	–9.82	3.93	355	–2.50	0.0127*
-ly	–1.84	3.78	349	–0.48	0.6256
im-: singleton	0.11	3.77	351	0.03	0.9759
un-: singleton	5.36	3.69	371	1.45	0.1469
-ness: singleton	5.27	3.99	357	1.33	0.1871
-ly: singleton	7.83	3.85	353	2.03	0.0422*

p<.05,
p<.001.