highly significantp = 0.002
The correlation between the grade of ARO and percentage of oesophagus treated at 60 Gy was not statistically significant for the whole cohort ( n = 54, r s = 0.104, p = 0.455) but highly significant for the subset of patients receiving 60 Gy to the oesophagus ( n = 25, r s = 0.591, p = 0.002).