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Table 3 Univariate analysis of factors associated with removal of at least 12 lymph nodes

From: Factors predicting adequate lymph node yield in patients undergoing pancreatoduodenectomy for malignancy

Factor Lymph node count P b
<12 (n = 179) ≥12 (n = 483)
Gender    0.171
 Female 79 (44) 184 (38)
 Male 100 (56) 299 (62)
Age    0.125
 <70 years 161 (90) 401 (83)  
 ≥70 years 18 (10) 82 (17)
Cancer site    0.225
 Pancreas 88 (49) 300 (62)
 Ampulla of Vater 79 (44) 157 (33)
 Common bile duct 12 (7) 26 (5)
Comorbidities    0.893
 No 90 (50) 237 (49)
 Yes 89 (50) 246 (51)
ASA class    0.259
 I or II 134 (75) 336 (70)
 III or IV 45 (25) 147 (30)
Preoperative biliary drainage    0.179
 No 107 (60) 257 (53)
 Yes 72 (40) 226 (47)
Body mass index    0.006
 <25 91 (51) 314 (65)
 ≥25 88 (49) 169 (35)
Tumor diameter    <0.001
 <20 mm 66 (37) 101 (21)
 ≥20 mm 113 (63) 382 (79)
Lymph node metastases    0.001
 No 111 (62) 155 (32)
 Yes 68 (38) 328 (68)
Pathologist    0.767
 Single 159 (89) 425 (88)
 Various 20 (11) 58 (12)
Type of resectiona    0.001
 Pancreatoduodenectomy (PD) 102 (57) 362 (75)
 Pylorus-reserving PD 77 (43) 121 (25)
Lymphadenectomy    0.001
 Standard 156 (87) 328 (68)
 Radical 23 (13) 155 (32)
  1. aIncluding total pancreatectomy with resection of the distal stomach (classified as PD) and without (pylorus-preserving PD)
  2. bChi-square test; numbers in parentheses are percentages