Table 1. Evaluation Group, Planned Year of Start of Screening, Age at Screening Start, Start of Follow-Up, Total Number, and Proportion of Women by Birth Year.
| Birth year | Groupa | Screening start | Age at start, y | Start of follow-up | Proportion women, % | Total No. |
|---|---|---|---|---|---|---|
| 1938 | Control | No screening | NA | 2008 | 52.5 | 15 208 |
| 1939 | Control | No screening | NA | 2008 | 51.4 | 16 194 |
| 1940 | Exposure | 2009 | 69 | 2009 | 51.1 | 15 402 |
| 1941 | Control | No screening | NA | 2008 | 51.5 | 18 322 |
| 1942 | Exposure | 2008 | 66 | 2008 | 51.0 | 20 808 |
| 1943 | Exposure | 2011 | 68 | 2011 | 51.2 | 21 864 |
| 1944 | Exposure | 2009 | 65 | 2009 | 51.2 | 24 889 |
| 1945 | Control | 2013 | 68 | 2008 | 51.0 | 26 481 |
| 1946 | Exposure | 2008 | 62 | 2008 | 51.5 | 26 265 |
| 1947 | Control | 2013 | 66 | 2008 | 51.0 | 26 551 |
| 1948 | Exposure | 2012 | 64 | 2012 | 52.4 | 23 888 |
| 1949 | Exposure | 2009 | 60 | 2009 | 51.5 | 24 043 |
| 1950 | Exposure | 2010 | 60 | 2010 | 50.3 | 23 613 |
| 1951 | Control | 2013 | 62 | 2008 | 50.7 | 23 729 |
| 1952 | Exposure | 2012 | 60 | 2012 | 50.0 | 22 898 |
| 1953 | Control | 2015 | 60 | 2008 | 49.8 | 24 660 |
| 1954 | Control | 2014 | 60 | 2008 | 49.3 | 24 633 |
Abbreviation: NA, not applicable.
a
Exposure group: individuals invited to early start of screening (2008-2012). Control group: individuals invited to late start of screening (2013-2015) or were never invited.