Males		Females
Formant	t (df = 28)	p-value	t (df = 41)	p value
Upright
F1	−1.12	0.272	−1.51	0.0139
F2	1.96	0.061	0.07	0.947
F3	−1.217	0.234	0.193	0.848
F4	−0.787	0.439	−0.615	0.542
	t (df = 40)	p-value	t (df = 40)	p-value
Supine
F1	−0.34	0.738	−0.85	0.402
F2	2.44	0.019	−1.38	0.177
F3	−1.12	0.270	−0.037	0.971
F4	0.57	0.575	0.643	0.525