A statistically significant association of VDR ApaI polymorphism with overall PD risk was discovered in allelic, homozygous, dominant, and recessive models (A vs. a: OR = 1.37, 95% CI = 1.12–1.67, P = 0.002; AA vs. aa: OR = 1.92, 95% CI = 1.24–2.97, P = 0.004; AA/Aa vs. aa: OR = 1.37, 95% CI = 1.03–1.81, P = 0.028; AA vs. Aa/aa: OR = 1.72, 95% CI = 1.17–2.52, P = 0.006, Figure 5 and Table 6). The gene discussed is VDR; the disease is Parkinson disease.