. Author manuscript; available in PMC: 2013 Sep 1.

Published in final edited form as: J Voice. 2011 Dec 29;26(5):667.e1–667.e6. doi: 10.1016/j.jvoice.2011.08.011

TABLE 3.

Relationship Between Depression and Duration of Disease in SD Patients and Controls

Duration of Disease, y	Proportion of Patients Who Are Depressed		Test of Whether the Association Between Depression and Duration of Disease Differed Between SD Patients and Controls^*
Duration of Disease, y	Controls	SD
<5	24/105 (23%)	2/18 (11%)	P = 0.21
5–10	5/10 (50%)	6/26 (23%)
>10	13/31 (42%)	28/83 (34%)

Based on a logistic regression model in which depression was the outcome and an interaction effect was entered between SD and duration of disease (coded as a continuous variable). Results were adjusted for age and gender.