Mean (standard deviation, SD), median (interquartile range, IQR) and 10thpercentile of the number of excised (LNs) for each center.

Statistics / Center 1 / Center 2 / Center 3 / Center 4 / Center 5 / Center 6 / Center 7 / Center 8 / Center 9
THREE-LEVELS AXILLARY LYMPH NODE DISSECTION
No. of patients / 33 / 47 / 115 / 50 / 328 / 293 / 116 / 36 / 102
No of excised LNs
Mean (SD) / 21 (9) / 19 (7) / 21 (7) / 17 (6) / 24 (9) / 19 (7) / 24 (9) / 31 (10) / 19 (8)
Median (IQR) / 19 (15-23) / 18 (15-24) / 20 (15-26) / 16 (13-20) / 23 (19-27) / 18 (15-23) / 23 (17-28) / 33 (22-37) / 18 (13-24)
10th percentile / 12 / 11 / 12 / 13 / 12 / 12 / 14 / 22 / 10
THREE OR LESS LEVELS NECK LYMPH NODE DISSECTION
No. of patients / NA / NA / NA / NA / 63 / 12 / NA / NA / 2
No of excised LNs
Mean (SD) / NA / NA / NA / NA / 23 (16) / 17 (11) / NA / NA / 25 (11)
Median (IQR) / NA / NA / NA / NA / 22 (14-35) / 16 (10-20) / NA / NA / 25.5 (18-33)
10th percentile / NA / NA / NA / NA / 9 / 10 / NA / NA / 18
FOUR OR MORE LEVELS NECK LYMPH NODE DISSECTION
No. of patients / 3 / NA / 15 / 4 / 31 / 29 / 33 / 1 / 19
No of excised LNs
Mean (SD) / 31 (6) / NA / 30 (13) / 24 (17) / 33 (15) / 27 (12) / 34 (16) / 48 (-) / 29 (15)
Median (IQR) / 32 (24-36) / NA / 26 (18-41) / 24 (10-5-38.5) / 28 (23-43) / 24 (17-34) / 31 (48-24) / 48 (48-48) / 27 (14-34)
10th percentile / 24 / NA / 17 / 8 / 19 / 14 / 13 / 48 / 10
Statistics / Center 1 / Center 2 / Center 3 / Center 4 / Center 5 / Center 6 / Center 7 / Center 8 / Center 9
INGUINAL LYMPH NODE DISSECTION
No. of patients / 7 / NA / 80 / 13 / 38 / 43 / 9 / 1 / 18
No of excised LNs
Mean (SD) / 10 (1) / NA / 11 (4) / 16 (7) / 15 (7) / 19 (4) / 9 (5) / 5 (-) / 10 (4)
Median (IQR) / 10 (10-12) / NA / 11 (9-13.5) / 14 (12-19) / 14 (10-19) / 10 (9-13) / 10 (5-11) / 5 (5-5) / 9.5 (7-12)
10th percentile / 9 / NA / 7 / 11 / 6 / 5 / 2 / 5 / 4
ILIO-INGUINAL LYMPH NODE DISSECTION
No. of patients / 17 / 35 / 12 / 24 / 414 / 173 / 159 / 33 / 88
No of excised LNs
Mean (SD) / 22 (12) / 18 (5) / 21 (8) / 20 (9) / 24 (7) / 17 (6) / 21 (7) / 33 (9) / 21 (9)
Median (IQR) / 17 (16-23) / 17 (14-22) / 19 (17-5.22) / 18.5 (14-22.5) / 23 (18-28) / 16 (13-21) / 21 (16-26) / 33 (27-35) / 19 (15-25)
10th percentile / 13 / 11 / 17 / 12 / 15 / 15 / 12 / 23 / 12