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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%)