borderline significantp=0.06
Prior radiation therapy had a borderline significant effect on absolute and relative NCP progression in the full cohort (β=−70.9, p=0.06 and β=−4.5, p=0.29, online supplemental table S2 ) and among the cases (β=−101.5, p=0.06 and β=−7.8, p=0.08, online supplemental table S3 ).