borderline significancep = 0.051
On post-hoc comparisons between PET1, PET3, and PET4, a decreased 47.5 Gy uptake ratio was observed on PET4 compared with PET3, but with borderline significance ( p = 0.051), and the 47.5 Gy uptake ratio on PET4 was still significantly higher than that on PET1 ( p < 0.001).