. 2017 Nov 6;5(11):e169. doi: 10.2196/mhealth.8238

Table 4.

Statistically significant Spearman correlation between formant frequencies, bandwidths, and clinical variables on the female (n=129) population (for clarity, nonsignificant correlation values are omitted).

Feature		Apnea-hypopnea index	Weight	Height	Age	Body mass index	Cervical perimeter
Vowel /a/
	Formant, F1	−.26^a			−.25^a		−.24^a
	F2				−.20^b
	F3				−.25^a		−.21^b
	Bandwidth, BW1		−.19^b			−.19^b
	BW2				−.17^b
Vowel /e/
	F2	−.24^a			−.19^b
	F3				−.22^a
	BW2				−.21^a
Vowel /i/
	F2	−.26^a
Vowel /o/
	F2				−.20^b		−.20^b
	F3				−.21^b		−.17^b
	BW3			−.27^a
Vowel /u/
	F2				−.18^b

^aCorrelation is significant at the .01 level (two-tailed).

^bCorrelation is significant at the .05 level (two-tailed).