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Participant numbers in cohort 1 and cohort 2
| Exposure variables | Outcome variable | |||
| Smoking | Alcohol | BMI | Parkinson’s disease | |
| Cohort 1 | Ever-smokers: 533,995 | 1,203,903 | 1,268,201 | Cases: 9,852 |
| Never-smokers: 728,610 | Controls: 1,206,650 | |||
| Cohort 2 | Ever-smokers: 533,704 | 1,204,410 | 1,267,856 | Cases: 10,072 |
| Never-smokers: 728,847 | Controls: 1,206,437 |
