Table 3: Postoperative characteristics.

CharacteristicsLow-volume surgeon ()
Number of cases (%)
High-volume surgeon ()
Number of cases (%)
value

Tumor stage
 134 (8)22 (7)0.03
 282 (18)74 (23)
 3290 (64)206 (65)
 445 (10)15 (5)

Nodal stage
 0250 (55)197 (62)0.18
 1140 (30.8)78 (24)
 262 (14)46 (14)
 31 (0.2)0 (0)

Metastatic stage
 0394 (87)303 (94)<0.001
 159 (13)18 (6)

Number of lymph nodes
 Median (95% CI)13.5 (7.3–19.7)15.3 (8.5–22.1)<0.001

Resection margins
 Complete resection (R0)430 (95)314 (98)0.11
 Microscopically irradical (R1)15 (3)4 (1)
 Macroscopically irradical (R2)8 (2)3 (1)

Length of hospital-stay
 Median in days (95% CI)13.1 (6.4–19.8)10.2 (4.8–15.6)<0.001

Surgical adverse events
 No324 (72)216 (67)0.21
 Yes 129 (28)105 (33)

Nonsurgical adverse events
 No383 (85)283 (88)0.15
 Yes70 (15)38 (12)

Severity of adverse event
 No277 (61)197 (61)0.74
 Self-limiting73 (16)59 (18)
 Temporary, invasive procedure87 (19)57 (18)
 Lasting negative effect2 (1)2 (1)
 Death 14 (3)6 (2)

Reintervention
 None364 (80)266 (83)0.20
 Radiological7 (2)9 (3)
 Surgical82 (18)46 (14)

Adjuvant chemotherapy
 No 313 (69)243 (76)0.04
 Yes140 (31)78 (24)

According to the AJCC TNM-staging system [17]; 95% confidence interval.