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Table 2 Characteristics associated with colorectal cancer mortality post diagnosis and colonoscopy history (deaths by December 31st, 2013, registered in 2003–2013, South Australia (n = 12,906)

From: Pre-diagnostic colonoscopies reduce cancer mortality - results from linked population-based data in South Australia

Characteristics Colorectal cancer death n = 3771 Other death n = 1621 Alive n = 7514 Unadjusted SHR (95% CI) *
Mean age (SD) at diagnosis (years) 72.2 (13.2) 78.3 (10.0) 67.4 (12.6) 1.13 (1.11–1.16)
Age at diagnosis (years)
  < 60 652 (17.3%) 68 (4.2%) 1887 (25.1%) 1.00
 60–69 781 (20.8%) 193 (11.9%) 2118 (28.2%) 1.00 (0.91–1.11)
 70–79 1056 (28.0%) 495 (30.5%) 2194 (29.2%) 1.13 (1.03–1.25)
  > 80 1280 (34.0%) 865 (53.4%) 1310 (17.5%) 1.70 (1.55–1.87)
Sex
 Male 2014 (53.6%) 917 (56.6%) 3881 (53.6%) 1.00
 Female 1745 (46.4) 703 (43.4%) 3361 (46.4%) 1.03 (0.97–1.10)
Country of birth
 Australia & NZ 2599 (71.1%) 1113 (71.1%) 4980 (68.3%) 1.0
 Europe 957 (26.2%) 427 (27.3%) 1700 (23.3%) 1.03 (0.96–1.11)
 North Africa/ Middle East 10 (0.3%) 2 (0.1%) 22 (0.3%) 0.99 (0.54–1.82)
 Asia and Pacific Islands 47 (1.2%) 15 (1.0%) 106 (1.5%) 0.87 (0.66–1.15)
 Americas 14 (0.4%) 2 (0.1%) 23 (0.3%) 1.35 (0.80–2.28)
 Africa (other) 32 (0.9%) 7 (0.5%) 461 (6.3%) 0.66 (0.46–0.95)
Indigenous
 No 3653 (99.5%) 1576 (99.9%) 6843 (99.7%) 1.00
 Yes 17 (0.5%) 2 (0.1%) 19 (0.3%) 1.85 (1.12–3.05)
Remoteness
 Major city 2663 (70.6%) 1199 (74.0%) 5334 (71.0%) 1.00
 Inner regional 386 (10.2%) 156 (9.6%) 859 (11.4%) 0.95 (0.85–1.05)
 Outer regional and remote 722 (19.2%) 266 (16.4%) 1319 (17.6%) 1.11 (1.02–1.20)
SES disadvantage quintile
 1st (most disadvantage) 1020 (27.1%) 406 (25.1%) 1785 (23.8%) 1.00
 2nd 838 (22.3%) 346 (21.4%) 1687 (22.5%) 0.92 (0.84–1.00)
 3rd 689 (18.3%) 365 (22.5%) 1427 (19.0%) 0.84 (0.77–0.93)
 4th 699 (18.6%) 283 (17.5%) 1442 (19.2%) 0.89 (0.81–0.98)
 5th (least disadvantage) 519 (13.8%) 220 (13.6%) 1165 (15.5%) 0.82 (0.73–0.91)
Local Health Network code
 Country Health SA 1211 (32.1%) 474 (29.2%) 2428 (32.3%) 1.00
 Central Adelaide 1122 (29.8%) 527 (32.5%) 2127 (28.3%) 1.00 (0.92–1.09)
 Northern Adelaide 755 (20.0%) 273 (16.8%) 1472 (19.6%) 1.04 (0.95–1.14)
 Southern Adelaide 683 (18.1%) 347 (21.4%) 1484 (19.8%) 0.90 (0.82–0.98)
Years survived on Dec 31st 2013 Median (IQR) 2.8 (0.9–5.1) 2.8 (0.9–5.1) 4.4 (1.9–7.2)  
Cancer staging (max spread)
 Local 439 (18.1%) 547 (59.6.%) 2494 (58.2%) 1.00
 Regional 783 (32.2%) 277 (30.2%) 1393 (32.5%) 3.05 (2.72–3.42)
 Distant 1208 (49.7%) 94 (10.2%) 401 (9.4%) 11.41 (10.24–12.71)
Pre-diagnosis colonoscopy
 No 2505 (66.4%) 899 (55.5%) 4790 (63.8%) 1.00
 Yes 1266 (33.6%) 722 (44.5%) 2724 (36.3%) 0.83 (0.78–0.89)
Follow-up time from initial colonoscopy to diagnosis
  < 1 year 883 (69.8%) 529 (73.3%) 1577 (57.9%) 1.00
  > =1 year 383 (30.3%) 193 (26.7%) 1147 (42.1%) 0.82 (0.73–0.93)
Pre-diagnostic colonoscopy examinations
 One 1023 (80.8%) 560 (77.6%) 1991 (73.1%) 1.00
 Two 179 (14.1%) 119 (16.5%) 446 (16.4%) 0.90 (0.77–1.05)
  > = 3 64 (5.1%) 43 (6.0%) 287 (10.5%) 0.63 (0.49–0.81)
  1. *SHR (sub Hazard ratio) from competing risk survival analysis with death other than colorectal cancer as competing risk in the univariate model; cell totals < overall totals due to missing records