Table 2.

Hazard ratio and 95% confidence interval of Parkinson disease according to quintile of intake of total flavonoids in the Health Professionals Follow-up Study (1986) and the Nurses' Health Study (1984)^a

Abbreviation: BMI = body mass index

^aAdjustment for age (in months), smoking status (never smoker, past smoker, or current smoker: cigarettes/d, 1–14 or ≥15), BMI (<23, 23–24.9, 25–26.9, 27–29.9, or ≥30 kg/m²), use of nonsteroidal anti-inflammatory drugs (yes/no), and intake of total energy (kcal/d), caffeine (quintiles), alcohol, and lactose (quintiles).

^bRandom-effects models were used, p for heterogeneity 0.02.