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Table 1 Relationship between demographic, clinical, and healthcare factors and breast cancer detection mode

From: Factors related to breast cancer detection mode and time to diagnosis in Alberta, Canada: a population-based retrospective cohort study

Factor Total Screen detected Symptom detected
N (12373) N (4747) %a (38.4) N (7626) %a (61.6)
Demographic factors  
Age*      
 39- 661 0 (0) 661 (100)
 40–49 2660 838 (31.5) 1822 (68.5)
 50–69 6046 2857 (47.3) 3189 (52.7)
 70–74 1056 487 (46.1) 569 (53.9)
 75+ 1950 565 (29.0) 1385 (71.0)
Neighborhood Income Quintile*      
  > 80 % 2694 1121 (41.6) 1573 (58.4)
 60 % ~ 80 % 2388 922 (38.6) 1466 (61.4)
 40–60 % 2547 967 (38.0) 1580 (62.0)
 20 % ~ 40 % 2443 911 (37.3) 1532 (62.7)
  < 20 % 2247 809 (36.0) 1438 (64.0)
 Missing 54 17 (31.5) 37 (68.5)
Clinical factors  
Stage*      
 In Situ 1588 967 (60.9) 621 (39.1)
 I 4803 2440 (50.8) 2363 (49.2)
 II 3821 1017 (26.6) 2804 (73.4)
 III 1489 230 (15.4) 1259 (84.6)
 IV 405 43 (10.6) 362 (89.4)
 Missing 267 50 (18.7) 217 (81.3)
Histological Grade*      
 Well differentiated 2359 1165 (49.4) 1194 (50.6)
 Moderately differentiated 4976 1977 (39.7) 2999 (60.3)
 Poorly or undifferentiated 4408 1331 (30.2) 3077 (69.8)
 Unknown/Not stated/Not applicable 630 274 (43.5) 356 (56.5)
Charlson Comorbidity Index*      
 0 8961 3507 (39.1) 5454 (60.9)
 1 2348 912 (38.8) 1436 (61.2)
  > =2 1064 328 (30.8) 736 (69.2)
Healthcare factors  
Time Period*      
 2004–2006 5004 1732 (34.6) 3272 (65.4)
 2007–2010 7369 3015 (40.9) 4354 (59.1)
Usual Provider Continuity*      
 High continuity (>0.75) 5037 2104 (41.8) 2933 (58.2)
 Low continuity (<=0.75) 5731 2139 (37.3) 3592 (62.7)
 Minimum doctor visits 1605 504 (31.4) 1101 (68.6)
Community Size and Metropolitan Influence Zone*      
 Urban 9741 3872 (39.7) 5869 (60.3)
 Rural 2632 875 (33.2) 1757 (66.8)
  1. aPercentages are row percents. *P-value < 0.001