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Table 1 Demographics and tumor characteristics of patients diagnosed with stage I to IV CRC

From: Does geography influence the treatment and outcomes of colorectal cancer? A population-based analysis

   RHA group
Variable Overall (N = 2,086) Winnipeg (n = 1,206) North Manitoba (n = 65) South Manitoba (n = 496) Middle Manitoba (n = 319) P value
Mean age in years (range) 70 ± 13.00 70 ± 13.21 65 ± 13.06 70 ± 13.08 71 ± 11.80 0.004
(20 to 103) (25 to 103) (31 to 92) (20 to 94) (39 to 94)
Age group (n (%))       
  >70 years 1,182 (56.66) 695 (57.63) 25 (38.46) 277 (55.85) 185 (57.99) 0.022
  <70 years 904 (43.34) 511 (42.37) 40 (61.54) 219 (44.15) 134 (42.01)  
Age quartilesa (n (%))       
  Quartile 1 542 (25.98) 324 (26.87) 27 (41.54) 129 (26.01) 62 (19.44) 0.004
  Quartile 2 522 (25.02) 282 (23.38) 17 (26.15) 120 (24.19) 103 (32.29)  
  Quartile 3 530 (25.41) 312 (25.87) 12 (18.46) 128 (25.81) 78 (24.45)  
  Quartile 4 492 (23.59) 288 (23.88) 9 (13.85) 119 (23.99) 76 (23.82)  
Gender (n (%))       
  Female 963 (46.16) 576 (47.76) 29 (44.62) 223 (44.96) 135 (42.32) 0.323
  Male 1,123 (53.84) 630 (52.24) 36 (55.38) 273 (55.04) 184 (57.68)  
Diagnosis year (n (%))       
  2004 706 (33.84) 413 (34.25) 20 (30.77) 164 (33.06) 109 (34.17) 0.932
  2005 671 (32.17) 389 (32.26) 25 (38.46) 156 (31.45) 101 (31.66)  
  2006 709 (33.99) 404 (33.50) 20 (30.77) 176 (35.48) 109 (34.17)  
Site (n (%))       
  Colon 1,376 (65.96) 788 (65.34) 44 (67.69) 336 (67.74) 208 (65.20) 0.486
  Rectosigmoid 202 (9.68) 116 (9.62) 7 (10.77) 54 (10.89) 25 (7.84)  
  Rectum 508 (24.35) 302 (25.04) 14 (21.54) 106 (21.37) 86 (26.96)  
AJCC stage (n (%))       
  I 403 (19.32) 226 (18.74) 7 (10.77) 114 (22.98) 56 (17.55) 0.069c
  II 575 (27.56) 334 (27.69) 19 (29.23) 139 (28.02) 83 (26.02)  
  III 610 (29.24) 364 (30.18) 15 (23.08) 134 (27.02) 97 (30.41)  
  IV 439 (21.05) 255 (21.14) 20 (30.77) 95 (19.15) 69 (21.63)  
  Unknown/NAb (n (%)) 59 (2.83) 27 (2.24) 4 (6.15) 14 (2.82) 14 (4.39)  
  1. aQuartile 1: age 20 years to 61 years, quartile 2: age greater than 61 years to 72 years, quartile 3: age greater than 72 years to 80 years, and quartile 4: age greater than 80 years to 103 years; bone or more elements of the AJCC stage is missing or staging scheme is not applicable; cusage of Monte-Carlo estimation of exact P value instead of direct P value computations, since the sample size is large and some cell values are less than five. AJCC American Joint Committee on Cancer, CRC colorectal cancer, NA not applicable, RHA regional health authority.