4.

ADC values (×10^–3 mm²/s) for each stage in the three prognostic groups according to the 7th TNM classification

TNM stage	Median ADC (IQR)	P
ADC, apparent diffusion coefficient; IQR, interquartile range;a, stage Ivs. II;b, stage IIvs. III.
Stage I	1.90 (1.62–2.04)
Stage II	1.51 (1.46–1.65)	0.001a
Stage III	1.22 (1.06–1.32)	<0.001b