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Table 1 Characteristics of CRC for each calendar period of admission

From: Long-term trends in colorectal cancer: incidence, localization, and presentation

Year 1980–1986 1987–1996 1997–2006 2007–2016 Total P value
Patients       0.53 a
 Male 136 (51) 270 (54) 341 (51) 447 (54) 1.194  
 Female 133 (49) 234 (46) 322 (49) 385 (46) 1.074  
Age       0.004 b
 < 65 75 (28) 130 (26) 189 (29) 183 (22) 577  
 65–75 83 (31) 179 (36) 173 (26) 272 (33) 707  
 75–80 50 (19) 76 (15) 122 (18) 142 (17) 390  
 80–85 46 (17) 75 (15) 109 (16) 128 (15) 358  
 > 85 15 (6) 44 (9) 70 (11) 107 (13) 236  
Localization       0.29 c
 Right colon 99 (37) 177 (35) 252 (38) 327 (39) 855  
 Left colon 78 (29) 168 (33) 211 (32) 239 (29) 696  
 Rectum 92 (34) 159 (32) 200 (30) 266 (32) 717  
Acute presentation
 Colorectal obstruction 23 (8.6) 57 (11.3) 63 (9.5) 88 (10.6) 231 0.69 a
 Perforation 18 (6.7) 17 (3.4) 20 (3.0) 13 (1.6) 68 < 0.001 a
Stage
 I 34 (13) 53 (11) 92 (14) 173 (21) 353 < 0.001 d
 II 81 (30) 163 (32) 243 (37) 309 (37) 798  
 III 70 (26) 119 (24) 133 (20) 174 (21) 495  
 IV 65 (24) 128 (25) 155 (23) 174 (21) 524  
 Unknown 19 (7) 41 (8) 40 (6) 2 (0.2) 103  
  1. Values in parenthesis are percentages of column total
  2. a Cochran-Armitage exact trend test
  3. b Ordinal logistic regression with calendar period as covariate
  4. c Multinomial logistic regression with calendar period as covariate
  5. d Ordinal logistic regression with calendar period as covariate, for known stages
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