Note: The following text consists of a brief documentation and 
three data sets used in Biometrics manuscript #001017. 


Notation for the variables:

interval: screening intervals
totwomen: total number of participated women at the i-th exam
scases: total number of screen detected cases at the i-th exam
icases: total number of interval cases between two consecutive exams


HIP data:
---------

interval totwomen scases icases
1          20166      55   13
2          15936      32    8
3          13679      18   10
4          11971      27   10

total number of cases detected by mammogram only in 4 screen exams = 44
total number of cases detected by CBE only in 4 screen exam=59
total number of screen detected cases (by both mammogram and CBE) = 29


CNBS study for women aged 40-49:
-------------------------------
interval   totwomen scases icases
1          25214       98  19
2          22424       39  16
3          22066       44   8

total number of cases detected by mammogram only in 3 screen exams = 64
total number of cases detected by CBE only in 3 screen exam=60
total number of screen detected cases (by both mammogram and CBE) in 3 exam=57


CNBS study for women aged 50-59:
------------------------------

interval   totwomen scases icases
1          19711     142  15
2          17669      66  10
3          17347      43   8
4          17193      54   9

total number of cases detected by mammogram only in 4 screen exams = 160
total number of cases detected by CBE only in 4 screen exams = 62
total number of screen detected cases (by both mammogram and CBE) in 4 exams=83