The researchers recruited participants with Parkinson’s Disease as case and those without Parkinson’s Disease as control. Interviews were conducted to study the exposure to caffeine. Two hundred and twenty-five patients with Parkinson’s Disease were recruited for the study (100 in the case group and 125 in the control group); 48 in the group with Parkinson’s Disease were exposed to caffeine. Thirty-eight participants in the control group were exposed to caffeine.
- Construct a 2 × 2 table，
- Explore the association between caffeine and Parkinson’s Disease and interpret your results.
- Identify 1 type of potential bias in this study design and how can it be avoided or minimized.