Statistical analysis
pneumonia, weight loss
PNEUMONIA
This study is a preliminary study and required sample size was calculated using G*Power 3.1Statistical analyses were performed using the Statistical Package for Social Sciences (version 22.0; IBM Corp., Armonk, NY, USA). The Wilcoxon signed-rank test was used to compare the VFSS findings (PAS, FDS, and number of swallows) for barium sulfate and iohexol. The Mann–Whitney test was used to compare the VFSS findings of each contrast agent in participants with or without subsequent pneumonia and unintentional weight loss. Receiver operating characteristic (ROC) curve analysis was performed to evaluate the predictive accuracy of VFSS findings for subsequent pneumonia and unintentional weight loss during the 3-month follow-up period. An area under the ROC curve (AUC) of 0.5, 0.7 to 0.8, 0.8 to 0.9, and more than 0.9 suggests no discrimination, acceptable diagnostic value, excellent diagnostic value, and an outstanding diagnostic value, respectively