Table 1.

Reliabilities of voice acoustic measures and correlations with Hamilton Rating Scale for Depression (HAMD) severity.

VA measure	Reliabilityb	HAMD Associationc	p
F0 COVa	.61	-.01	ns
F1 COVa	.24	-.03	ns
F2 COVa	-.02	-.17	< .05
Total recording length of speech sample	.57	.20	< .01
Total vocalization time	.66	.07	ns
Total pause time	.71	.29	< .001
Number of pauses	.71	.10	ns
Pause variability (St. Dev.)	.64	.38	< .001
Percent pause time	.04	.18	< .01
Vocalization/pause ratio	.48	-.22	= .001
Speaking rate (syllables/sec)	.65	-.23	< .001

^aCoefficient of Variation

^bCronbach’s alpha, assessed across speech tasks within each telephone call

^cPearson’s correlation