For cerebrovascular mortality (Figure 6), non-Hispanic White individuals (HR = 2.62, 1.54–4.47; p for interaction = 0.032), participants with BMI ≥ 29 kg/m2 (HR = 2.49, 1.63–3.81; p for interaction = 0.002), and non-CKD (HR = 4.35, 2.45–7.71; p for interaction = 0.001) significantly modified the association between cystatin C and mortality risk. The gene discussed is CST3; the disease is chronic kidney disease.