Table 3. Summary of the generalized linear model predicting the classification of phoneme /o/ and /u/ for male

	Estimate	SE	z-value	p-value
(Intercept)	0.07696	0.27404	0.281	0.778826
F1	–1.15664	0.33676	–3.435	0.000593***
F2	2.45995	0.50344	4.886	1.03e-06***
H1-H2	0.31157	0.32001	0.974	0.330242
H1-A1	1.22978	0.34039	3.613	0.000303***

Formula: phoneme~F1+F2+H1-H2+H1-A1, family=binomial (link= “logit”). Significant results are presented in bold.
p<.001.