TABLE IV.

Results are shown for the best−fit model of perceived speaker clarity in the repetition task. ^a

Model: Clarity (Repetition Task), Adjusted R2 = 0.61	β	t	p
(Constant)		−5.31	0.000
Age in months	0.42	3.78	0.000
Articulation rate	0.27	2.47	0.017
Mean F1 – F0	0.47	3.54	0.001
SD F1 – F0	0.24	2.53	0.015
Mean F2 – F1	0.27	2.07	0.045
SD F0	−0.20	−1.95	0.057

^aDependent variable: Clarity ratings for each speaker averaged across utterances and listeners.