Statistical analysis
REGRESSION
Patient experience was dichotomised to form a binary outcome, as previously described. The median IAPS score and interquartile range (IQR) were calculated for all participants of the study cohort and both patient experience groups. The distribution of participants’ IAPS scores are presented in a histogram. The distributions of patient characteristics between the two groups were calculated and compared by univariable logistic regression. A multivariable logistic regression analysis to identify variables predictive of the least positive experience was conducted using backwards stepwise selection. Furthermore, univariable and multivariable regression analysis was carried out to identify any predictors of having a failed swallow at first attempt. We also used backwards stepwise selection for this multivariable regression. 