Role of Diet and Nutritional Supplements in Parkinson’s Disease Progression

Table 1

Demographics of the study participants.

Age, years (SD)	63.1 (9.2)
Years since diagnosis (SD)	5.2 (5.5)
Gender; Male; Female	463 (44%); 556 (53%)
Ethnicity; Caucasian; Black; Hispanic; Native American; Asian/Pacific Islander; Other	978 (92.9%); 7 (0.7%); 14 (1.3%); 2 (0.2%); 9 (0.9%); 12 (1.1%)
Income; Less than $20,000; Between $20 and 40,000; Between $40 and 60,000; Between $60 and 80,000; Between $80 and 100,000; Between $100 and 150,000; More than $150,000	56 (5.3%); 148 (14.1%); 139 (13.2%); 145 (13.8%); 137 (13%); 193 (18.3%); 155 (14.7%)
Hoehn & Yahr stage; (1) 1-sided symptoms, minimal disability; (2) Both sides affected, balance is stable; (3) Mild-to-moderate disability, balance affected; (4) Severe disability, able to walk and stand without help; (5) Confinement to bed or wheelchair unless aided; Do not know	522 (49.6%); 171 (16.2%); 292 (27.7%); 34 (3.2%); 2 (0.2%); 9 (0.9%)