Figure 2. Univariate and Multivariate Regressions of Presenting Symptoms for the Risk of Hospitalization.

Univariate and multivariate logistic regression analyses were performed on presenting symptoms based on risk for hospitalization (n = 66 for nonhospitalized and n = 25 for hospitalized). (A) Univariate logistic regression was performed on presenting symptoms. ORs with 95% CIs are listed in the table to the left. Significant correlations are indicated by bold font and *. Dyspnea, nausea/vomiting, and neurologic symptoms were found to be predictive of hospitalization, whereas headache was found to be predictive of nonhospitalization. (B) Stepwise multivariate logistic regression utilizing Akaike information criteria was performed using significant hospitalization risk factors in univariate analysis. Only significant independent risk factors for hospitalization are listed in the table (left) and figure (right). Only nausea/vomiting and neurologic symptoms (e.g., weakness, sensory symptoms, urinary retention, and gait instability) were found to be independent risk factors for hospitalization, whereas headache was the only independent predictor of nonhospitalization.