Table 8. Within-sex contrasts for the acoustic parameters across conditions in male speakers.

Acoustic parameters	Contrasts
	Neutral vs. Masc		Neutral vs. Fem
All vowels (N = 17)	F	p	F	p
F0mean	5.38	0.034*	36.95	<0.001*
F0CV	0.01	0.919	0.01	0.942
F1	0.07	0.798	4.18	0.058
F2	5.75	0.029*	7.08	0.017*
F3	7.45	0.015*	6.71	0.020*
F4	26.17	<0.001*	12.17	0.003*
ΔF	22.69	<0.001*	10.96	0.004*

F-ratio (F) and p-value (p) for: mean fundamental frequency (F0mean), coefficient of variation (F0CV), first four formant frequencies (F1–F4) and formant spacing (ΔF). Significant effects are indicated with an asterisk. “Masc” and “Fem” represent the masculinised and feminised conditions.