Table 1

Characteristics of patients who received diagnoses of colorectal cancer in Alberta from 2004 to 2015

CharacteristicNo. (%) of patients*p value
Patients aged < 50 yr
n = 1583
Patients aged ≥ 50 yr
n = 16 487
Sex0.1568
 Female728 (46.0 )7277 (44.1 )
 Male855 (54.0 )9210 (55.9 )
Age at diagnosis, yr, mean ± SD41.9 ± 7.070.4 ± 11.1< 0.0001
Diagnosis year0.0564
 2004–2007483 (30.5 )4951 (30.0 )
 2008–2011492 (31.1 )5591 (33.9 )
 2012–2015608 (38.4 )5945 (36.0 )
Charlson Comorbidity Index< 0.0001
 0821 (51.9 )5630 (34.1 )
 1184 (11.6 )2223 (13.5 )
 2578 (36.5 )8634 (52.4 )
Mean neighbourhood income< 0.0001
 < $46 000772 (48.8 )8996 (54.6 )
 ≥ $46 000786 (49.6 )7088 (43.0 )
 Unknown25 (1.6 )403 (2 .4)
Mean neighbourhood education0.0062
 < 80%641 (40.5 )7320 (44.4 )
 ≥ 80%937 (59.2 )9138 (55.4 )
AJCC stage< 0.0001
 08 (0.5 )111 (0.7)
 I271 (17 .1)2359 (14 .3)
 II255 (16.1 )3464 (21 .0)
 III260 (16 .4)2406 (14.6)
 IV264 (16.7)2283 (13.8)
 Unknown525 (33 .2)5864 (35.6)
Tumour location< 0.0001
 Colon856 (54 .1)10 524 (63.8)
 Sigmoid164 (10 .4)1600 (9.7)
 Rectum563 (35.6 )4363 (26.4)
Length of follow-up, yr, mean ± SD3.9 ± 3.23.3 ± 3.0< 0.0001
Death during follow-up period< 0.0001
 No1099 (69 .4)7988 (48.4)
 Yes484 (30.6)8499 (51.5)
Cancer-specific death during follow-up period< 0.0001
 No1147 (72.4)10 160 (61.6)
 Yes436 (27.5)6327 (38 .4)
  • AJCC = American Joint Committee on Cancer; SD = standard deviation.

  • * Unless indicated otherwise.

  • Mean neighbourhood education represents the percentage of people with a highschool degree or higher in a given committee. It is the mean value across an entire community in the province based on census data.