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Table 1 Characteristics of the study population

From: Organized breast screening improves reattendance compared to physician referral: a case control study

Factor   All women (n = 105,665)
Entire sample (% of total) Cases (% of total) Controls (% of total)
Socioeconomic status quintiles    
 First urban quintile (lowest) 12,499 (11.8%) 3,612 (13.4%) 8,887 (11.3%)
 Second urban quintile 15,686 (14.8%) 4,364 (16.2%) 11,322 (14.4%)
 Third urban quintile 16,523 (15.6%) 4,432 (16.4%) 12,091 (15.4%)
 Fourth urban quintile 19,040 (18.0%) 5,011 (18.6%) 14,029 (17.8%)
 Fifth urban quintile (highest) 23,555 (22.3%) 5,752 (21.3%) 17,803 (22.7%)
 Rural 18,259 (17.3%) 3,794 (14.1%) 14,465 (18.4%)
 Missing 103 (0.1%) 35 68
Age at initial scan    
 50-54 28, 090 (26.6%) 7,710 (28.6%) 20,380 (25.9%)
 55-59 32,413 (30.7%) 8,001 (29.6%) 24,412 (31.1%)
 60-64 26,663 (25.2%) 6,501 (24.1%) 20,162 (25.7%)
 65-69 18,499 (17.5%) 4,788 (17.7%) 13,711 (17.4%)
Cumulative Charlson score on index date    
 0 98,885 (93.6%) 25,135 (93.1%) 73,750 (93.8%)
 1 3,762 (3.6%) 1,049 (3.9%) 2,713 (3.5%)
 2 2,115 (2.0%) 548 (2.0%) 1,567 (2.0%)
 ≥3 903 (0.9%) 268 (1.0%) 635 (0.7%)
Women by gender of their PCP at index date    
 F 41,616 (39.4%) 10588 (39.2%) 31028 (39.5%)
 M 64,049 (60.6%) 16412 (60.8%) 47637 (60.5%)
Women by country of education of physician on index date    
 Canadian 82,020 (77.6%) 20322 (75.3%) 61,698 (78.5%)
 Anglosphere 7.639 (7.2%) 1995 (7.4%) 5644 (7.2%)
 Other 16,006 (15.1%) 4683 (17.3%) 11323 (14.3%)
Women by years since graduation of physician at index date    
 <10 5,573 (5.3%) 1,352 (5.0%) 4,221 (5.4%)
 10-19 21,621 (20.5%) 5525 (20.5%) 16,186 (20.6%)
 20-29 37,053 (35.1%) 9,522 (35.3%) 27,531 (35.0%)
 30-39 30,671 (29.0%) 7,758 (28.7%) 22,913 (29.2%)
 > = 40 10,657 (10.1%) 2,843 (10.5%) 7,814 (9.8%)
Women who still have a PCP at year one after index date    
 Yes 104,801 (99.2%) 26801 (99.3%) 78000 (99.2%)
 No 854 (0.8%) 199 (0.7%) 655 (0.8%)
Women whose Postal code has changed from index date to year one    
 Yes 6,264 (5.9%) 2152 (8.0%) 4112 (5.1%)
 No 99,401 (94.1%) 24848 (92.0%) 74553 (94.9%)
Baseline and re-exposure mammography facility    
 OBSP 63,264 (59.9%) 8,964 (33.2%) 54,230 (69.0%)
 Non-OBSP 42,401 (40.1%) 18,036 (66.8%) 24,365 (31.0%)
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