Ferrucci et al. (2000) investigated the relationship between disease severity and Qol. In which disease did they find a linear relationship (i.e. the more severe the symptoms, the lower perceived level of Qol)?

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Ferrucci et al. (2000) found a linear relationship between disease severity and quality of life (QoL) in Parkinson's disease, indicating that as the severity of Parkinson's disease symptoms increases, the perceived level of quality of life decreases.

Ferrucci Et Al