trend toward significanceP = .17
The 2 treatment factors with the closest trend toward significance were use of IMRT (β = −0.0001 [95% CI, −0.0007 to 0.0001]; P = .17) (eFigure 11A in Supplement 1 ) and neck dissection (β = −0.0003 [95% CI, −0.0007 to 0.0001]; P = .11) (eFigure 11B in Supplement 1 ), both of which appeared to correlate with lower rates of CNF.