Table 2.

Results of the linear mixed-effects model for Research Question 1: sentence intelligibility across speaking groups (Parkinson's disease and controls) and conditions (habitual, clear, hearing impaired, and overenunciate).

Effect	Num df	Den df	F value	p value
Group	1	1047	2.79	.095
Condition	3	1047	33.82	< .001
Group × Condition	3	1047	11.39	< .001

Note. Num df = number of degrees of freedom in the model; Den df = number of degrees of freedom associated with the model errors.