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Table 3 Comparison of clinicopathological characteristics according to the number of LNM risk factors

From: Validity of additional surgical resection by comparing the operative risk with the stratified lymph node metastatic risk in patients with early gastric cancer after endoscopic submucosal dissection

  n Total number of items p value
0/1 2 3
Total 58 40 14 4  
Age, mean ± SD (years) 67.4 (9.9) 66.3 (10.8) 68.4 (6.9) 74.8 (7.4) 0.38
Sex, n (%)
 Male 46 (79.3) 35 (87.5) 8 (57.1) 3 (75.0) 0.05
 Female 12 (20.7) 5 (12.5) 6 (42.9) 1 (25.0)  
Tumor size, mean ± SD (mm) 27.5 (14.0) 26.5 (15.0) 27.8 (11.1) 36.8 (11.6) 0.38
Depth of tumor, n (%)
 M 8 (13.8) 8 (20.0) 0 (0) 2 (1.6) < 0.01
 SM1 22 (37.9) 19 (47.5) 2 (14.3) 1 (25.0)
 SM2 28 (48.3) 13 (32.5) 12 (85.7) 3 (75.0)
Histological type, n (%)
 Differentiated 45 (77.6) 29 (72.5) 12 (85.7) 4 (100) 0.32
 Undifferentiated 13 (22.4) 11 (27.5) 2 (14.3) 0 (0)  
Lymphatic invasion, n (%)
 Negative 36 (62.1) 31 (77.5) 4 (28.6) 1 (25.0) < 0.01
 Positive 22 (37.9) 9 (22.5) 10 (71.4) 3 (75.0)  
Venous invasion, n (%)
 Negative 44 (75.9) 34 (85.0) 9 (64.3) 1 (25.0) 0.05
 Positive 14 (24.1) 6 (15.0) 5 (35.7) 3 (75.0)  
Ulceration (scar), n (%)
 Negative 35 (60.3) 27 (67.5) 6 (42.9) 2 (50.0) 0.24
 Positive 23 (39.7) 13 (32.5) 8 (57.1) 2 (50.0)  
Type of gastrectomy, n (%)
 DG 35 (60.3) 24 (60.0) 9 (64.3) 2 (50.0) 0.87
 TG 23 (39.7) 16 (40.0) 5 (35.7) 2 (50.0)
Postoperative complicationa, n (%)
 Negative 45 (77.6) 32 (80.0) 9 (64.3) 4 (100) 0.26
 Positive 13 (22.4) 8 (20.0) 5 (35.7) 0 (0)
30-day mortality, median range (%) 0.3 (0.1–6.3) 0.3 (0.1–6.3) 0.3 (0.1–0.4) 0.5 (0.2–0.6) 0.11
In-hospital mortality, median range (%) 0.5 (0.1–15.3) 0.5 (0.1–15.3) 0.5 (0.1–1.8) 0.7 (0.4–2.0) 0.59
Stratification risk of LNM, % (95% CI) 12.66 (10.51–15.07) 0.76 (0.16–2.20) 15.08 (11.26–19.60) 33.87 (25.62–42.91)  
  1. aClavien-Dindo classification grade 2 or more