Table 4.

Spearman rank order inter-correlations among acoustic variables are reported.

Acoustic variables	(1) Speech rate (syll/sec)	(2) Articulation rate (syll/sec)	(3) SPL SD (dB)	(4) SPL mean (dB)	(5) F2 IQR (Hz)	(6) F0 mean (Semitone)	(7) F0 SD (Semitone)	(8) F0 range (Semitone)
(1) Speech rate (syll/sec)	1
(2) Articulation rate (syll/sec)	0.978*	1
(3) SPL SD (dB)	−0.501*	−0.505*	1
(4) SPL Mean (dB)	0.223*	0.244*	−0.130	1
(5) F2 IQR (Hz)	−0.199*	−0.174	−0.010	0.005	1
(6) F0 Mean (Semitone)	−0.338*	−0.370*	0.200*	−0.258*	0.193*	1
(7) F0 SD (Semitone)	0.028	0.012	−0.090	0.066	0.237*	0.240*	1
(8) F0 Range (Semitone)	0.084	0.083	−0.090	0.283*	0.186*	0.020	0.857*	1

Note. Alpha level 0.05.

The sign of the correlation indicates the direction of the association. An asterisk indicates significant correlations (p<0.05).