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Table 3 Performance parameters

From: Introduction of organised mammography screening in Tyrol: results following first year of complete rollout

 

40-491)

50-691)

Total1)

Recall for further assessment rate [per 1000 screens] and number of recalls 2)

14.6 (273)

13.2 (318)

13.9 (591)

Intermediate screening test recommended in six months

18.9 (354)

12.1 (292)

15.1 (646)

Screening result unknown3)

2.8 (52)

1.9 (46)

2.3 (98)

Biopsy rate [per 1000 screens]

8.7 (163)

9.1 (220)

8.9 (383)

Cancer detection rate [per 1000 screens]

2.7 (51)

4.2 (102)

3.6 (153)

   Invasive

2.5 (46)

3.9 (93)

3.3 (139)

   In situ

0.3 (5)

0.4 (9)

0.3 (14)

Proportion of in situ cases

9.8%

8.8%

9.2%

Ratio screening breast cancer detection rate vs. background incidence rate 4)

2.1

2.0

2.0

PPV assessment

18.7% (51/273)

32.1%

(102/318)

25.9% (153/591)

PPV biopsy

31.3% (51/163)

46.4%

(102/220)

39.9% (153/383)

  1. 1) Rates were rounded to one decimal; numbers in brackets are numbers of cases (i.e. recall rate, biopsy rate, cancer detection rate). PPV is rounded to one decimal; numbers in brackets are detailed numbers for computing PPV.
  2. 2) For one case assessment was recommended, but performed at an institution outside the screening system.
  3. 3) Cases with BI-RADS 0 without assessment were treated as unknown.
  4. 4) Background incidence rate defined by years of diagnosis 1988-1992.