Diffusion-weighted magnetic resonance imaging for predicting the response of rectal cancer to neoadjuvant concurrent chemoradiation

Table 4 Mean tumor apparent diffusion coefficient values and P values for the comparisons between groups

Group	Apparent diffusion coefficient values (× 10-3 mm2/s)
	Week 0	Week 1	Week 2	Week 3	Week 4	Week 5
T downstage (n = 8)	0.702	0.720	0.890	0.724	0.690	0.743
No T downstage (n = 7)	0.803	0.824	0.877	0.875	0.851	0.947
P value	0.339	0.463	0.909	0.202	0.108	0.114
Good regression (n = 9)	0.658	0.670	0.851	0.618	0.673	0.713
Poor regression (n = 6)	0.885	0.907	0.933	0.938	0.903	1.027
P value	0.021	0.081	0.452	0.032	0.016	0.010