Table 3.

Average wound reduction rate for each institution

(%)	POD 3	POD 7	POD 10	POD 14
A: Institution I	36.1	56.1	64.0	77.9
II	19.2	36.8	46.7	60.7
III	–	–	–	–
p-value	0.318	0.182	0.194	0.206
B: Institution I	44.4	71.2	77.9	87.5
II	–	–	–	–
III	28.9	50.9	80.6	74.9
p-value	0.105	0.030	0.359	0.295
C: Institution I	32.9	58.6	69.0	77.6
II	74.0	87.8	69.8	53.8
III	–	–	–	–
p-value	0.039	0.010	0.490	0.157

Institution I: Toho University Omori Medical Center, II: Juntendo University Hospital, III: Kyorin University Hospital. POD postoperative day