Dementia, Parkinson’s disease, and the use of antipsychotic drugs were significant variables in the univariate analysis. Cerebrovascular disease showed a statistically significant relation with dementia (p = 0.02). These four variables, as well as the age variable, were included in the multivariate logistic regression analysis. Because the current study showed 43 cases with risk of aspiration, five variables is the maximum for inclusion in the multivariate logistic regression analysis (Harrell, Lee, Califf, Pryor, & Rosati, 1984). Using multivariate logistic regression analysis, the final prediction model for aspiration risk showed Parkinson’s disease as a significant positive factor (OR = 5.11; 95% CI [1.493, 17.519]). The use of antipsychotic drugs revealed a small but significant protective effect (Table 3).