Table 1 Characteristics of the study population by screening mammogram result. Women screened age 50–69 years

From: Long-term risk of screen-detected and interval breast cancer after false-positive results at mammography screening: joint analysis of three national cohorts

 

Mammogram classification

First FP result, N = 113,634

Second FP result, N = 8149

True negative, N = 3,388,667

Age at mammography, mean (SD)

56.4 (5.6)

59.3 (5.1)

58.3 (5.8)

Age at mammography, 5 years, N (%)

  50–54

52,460 (46.2%)

1822 (22.4%)

1,025,119 (30.3%)

  55–59

26,919 (23.7%)

2571 (31.5%)

963,718 (28.4%)

  60–64

21,191 (18.6%)

2149 (26.4%)

834,492 (24.6%)

  65–69

13,064 (11.5%)

1607 (19.7%)

565,338 (16.7%)

Mammography type, N (%)

  SFM

88,181 (77.6%)

5445 (66.8%)

2,744,952 (81.0%)

  FFDM

25,453 (22.4%)

2704 (33.2%)

643,715 (19.0%)

Type of attendance, N (%)

  Prevalent

64,073 (56.4%)

0 (0.0%)

1,085,394 (32.0%)

  Subsequent regular

46,684 (41.1%)

7453 (91.5%)

2,204,537 (65.1%)

  Subsequent irregular

2877 (2.5%)

696 (8.5%)

98,736 (2.9%)

  1. FP false-positive
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