. Author manuscript; available in PMC: 2012 Aug 14.

Published in final edited form as: J Speech Lang Hear Res. 2010 Nov 8;54(3):787–802. doi: 10.1044/1092-4388(2010/09-0085)

Table 6.

Correlations for individuals with PD.

Variable	1	2	3	4	5	6	7	8	9	10
1. Age^a	1	−.24	.18	.18	.19	.35	.04	−.14	.01	−.13
2. TPO^a	−.24	1	.13	.15	−.19	.06	−.51^*	−.30	.06	.23
3. Reduced loudness^a	.18	.13	1	.68^**	.46^*	.54^*	−.39	−.24	−.37	−.48^*
4. Reduced articulatory precision^a	.18	.15	.68^**	1	.52^*	.35	−.53^*	−.38	−.53^*	−.38
5. Speech rate^a	.19	−.19	.46^*	.52^*	1	.14	−.02	.20	.13	−.04
6. LA index^a	.35	.06	.54^*	.35	.14	1	−.45^*	.25	−.15	−.16
7. Production accuracy^a	.04	−.51^*	−.39	−.53^*	−.02	−.45^*	1	.43	.70^**	.72^**
8. Simple comprehension accuracy^b	−.14	−.30	−.24	−.38	.20	.25	.43	1	.72^**	.59^*
9. Subject-relative comprehension^b	.01	.06	−.37	−.53^*	.13	−.15	.70^**	.72^**	1	.80^**
10. Object-relative comprehension^b	−.13	.23	−.48^*	−.38	−.04	−.16	.72^**	.59^*	.80^**	1

Note. TPO = time postonset of PD; LA = lip aperture.

n = 16.

n = 14.

p < .05 (one-tailed).

^**

p < .01 (one-tailed).