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Table 1 Characteristics of index colorectal cancer among SPCRC patients according to prior tumor location

From: The risk and survival outcome of subsequent primary colorectal cancer after the first primary colorectal cancer: cases from 1973 to 2012

Variable RCC (n = 2572) LCC (n = 3166) ReC (n = 963) P
Age at diagnosis     < 0.0001
 median (range) 70 (14–97) 68 (27–96) 67 (22–96)  
  ≤ 50 194 (7.5) 209 (6.6) 71 (7.4)  
 51–60 339 (13.2) 568 (17.9) 204 (21.2)  
 61–70 776 (30.2) 1095 (34.6) 324 (33.6)  
 71–80 883 (34.3) 997 (31.5) 270 (28.0)  
  ≥ 81 380 (14.8) 297 (9.4) 94 (9.8)  
Year of diagnosis     0.158
 1973–1985 1273 (49.5) 1676 (53.0) 485 (50.4)  
 1986–1995 886 (33.7) 1008 (31.8) 332 (34.5)  
 1996–2005 433 (16.8) 482 (15.2) 146 (15.1)  
Race     0.007
 white 2218 (86.2) 2729 (86.2) 828 (86.0)  
 Black 214 (8.3) 211 (6.7) 62 (6.4)  
 Others 140 (5.5) 206 (7.1) 73 (7.6)  
Gender     <0.0001
 Female 1347 (52.4) 1389 (43.9) 402 (41.7)  
 Male 1225 (47.6) 1777 (56.1) 561 (58.3)  
Stage     <0.0001
 Localized 1008 (39.2) 1408 (44.4) 554 (57.5)  
 Regional 1395 (54.2) 1544 (48.8) 338 (35.1)  
 Distant 112 (4.4) 132 (4.2) 17 (1.8)  
 Unknown 57 (2.2) 82 (2.6) 54 (5.6)  
Tumor grade     <0.0001
 Grade I 307 (11.9) 438 (13.8) 123 (12.8)  
 Grade II 1302 (50.6) 1797 (56.8) 535 (55.6)  
 Grade III 537 (20.9) 357 (11.3) 116 (12.0)  
 Unknown 426 (16.6) 574 (18.1) 189 (19.6)  
  1. Abbreviations: SPCRC Subsequent primary colorectal cancer, RCC Right colon cancer, LCC Left colon cancer, ReC Rectal cancer