Fig. 2.

The panels depict the partial regression plots with fit line for the relationship between percent sleep and IL-6 (a) and CRP (b) in caregivers and controls. The strength of the partial correlations was significantly different between caregivers and controls for IL-6 (p = 0.043) and CRP (p = 0.028). All analyses were controlled for age, BMI, exercise, smoking and role overload. In addition, IL-6 and CRP values were adjusted for angiotensin converting enzyme inhibitor use and gender, respectively.