|
Scenario A
|
Scenario B
|
Scenario C
|
---|
Interval of exams
|
Annual
|
Biennial
|
Annual
|
Biennial
|
Annual
|
Biennial
|
---|
|
MR (%)
|
40-74
|
29.8
|
22.9
|
32.5
|
25.1
|
44.0
|
33.8
|
50-69
|
25.3
|
19.6
|
27.6
|
21.3
|
36.7
|
27.6
|
|
YLG per woman screened
|
40-74
|
0.222
|
0.165
|
0.203
|
0.151
|
0.208
|
0.154
|
50-69
|
0.176
|
0.132
|
0.161
|
0.120
|
0.162
|
0.119
|
|
YLG per breast cancer detected
|
40-74
|
1.874
|
1.387
|
1.711
|
1.272
|
1.753
|
1.300
|
50-69
|
1.485
|
1.109
|
1.353
|
1.010
|
1.367
|
1.003
|
- Relative BC mortality reduction (MR) and years of life gained (YLG). Catalonia, cohorts born in 1955-59.
- A: Survival probability density functions (pdfs): Catalonia 1980-1989 (pre-dissemination of mammography screening).
- B: Resulting survival pdfs after applying a hazard ratio of 0.75 to the 1980-1989 hazard rates, in order to take into account the effect of adjuvant treatments.
- C: Survival pdfs: Catalonia 1990-2001 (survival functions have not been corrected by the lead time bias that originates from earlier detection). This scenario produces an overestimation of the effect of early detection.