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Table 2 Baseline characteristics

From: A novel staging system and clinical predictive nomogram for more accurate staging and prognosis of malignant pancreatic intraductal papillary mucinous neoplasms: a population-based study

  The primary cohort (n = 1401) The validation cohort (n = 600)   The primary cohort (n = 1401) The validation cohort(n = 600)
Age, n, % Chemotherapy, n, %
 < 70 800 57.10% 366 61.0%  Yes 646 46.11% 300 50.0%
 ≥ 70 601 42.90% 234 39.0%  No/unknown 755 53.89% 300 50.0%
Sex, n, % Radiotherapy, n, %
 Female 671 47.89% 288 48.0%  Yes 282 20.12% 120 20.0%
 Male 730 52.11% 353 58.8%  No 1199 85.58% 480 80.0%
Marital status, n, %
 Married 863 61.60% 353 58.8%      
 Othersa 538 38.40% 247 41.2%      
      AJCC 7th, n, %
Race, n, %  0 222 15.85% 98 16.3%
 Others 151 10.78% 59 9.8%  IA 98 7.00% 20 3.3%
 Black 1096 78.23% 475 79.2%  IB 100 7.14% 41 6.8%
 White 154 10.99% 66 11.0%  IIA 141 10.06% 66 11.0%
   0.00%     IIB 260 18.56% 101 16.8%
Location, n, %  III 138 9.85% 74 12.3%
 Head 762 54.39% 339 56.5%  IV 442 31.55% 200 33.3%
 Body or tail 387 27.62% 160 26.7%      
 Othersb 353 25.20% 101 16.8% AJCC 8th, n, %
       0 222 15.85% 98 16.3%
Grade, n, %  IA 113 8.07% 33 5.5%
 Highc 191 13.63% 78 13.0%  IB 107 7.64% 48 8.0%
 Othersd 1210 86.37% 522 87.0%  IIA 119 8.49% 46 7.7%
       IIB 168 11.99% 66 11.0%
ELN, n, %  III 230 16.42% 109 18.2%
 < 15 1012 72.23% 448 74.7%  IV 442 31.55% 200 33.3%
 ≥ 15 389 27.77% 152 25.3%      
      AJCC modified, n, %
Extend, n, %  0 222 15.85% 98 16.3%
 Inside 666 47.54% 275 45.8%  IA 113 8.07% 33 5.5%
 Beyond 735 52.46% 325 54.2%  IB 226 16.13% 94 15.7%
       IIA 168 11.99% 66 11.0%
Surgery, n, %  IIB 92 6.57% 35 5.8%
 Yes 862 61.53% 343 57.2%  III 138 9.85% 74 12.3%
 No 539 38.47% 257 42.8%  IV 442 31.55% 200 33.3%
  1. a“Others” in marital status include single (never married), separated, divorced, widowed, unmarried or domestic partner and unknown
  2. b“Others” in location include pancreatic duct, others specified part of pancreas, overlapping lesion of pancreas and pancreas, NOS
  3. c“High” in grade include poorly differentiated and undifferentiated
  4. d“Others” in grade include well, moderately and unknown