83 Attendance characteristics of the breast and colorectal CSPs Results The databases contained 106.377 unique individuals on the BC-SP, and 73.669 on the CRC-SP. Analysis showed an overlap of 38,071 individuals, thus around a third, receiving invitations for both CSPs. Breast cancer screening programme Most women received seven invitations (27.0%), with a maximum of nine invitations (0.1%). Within the time period of 14 years, n=48,126 women (45.2%) received their first BC-SP invitation. In total n=79,594 women (74.8%) participated at least once. Among the invitees, n=3,820 (3.6%) women were diagnosed with BC, regardless of whether this tumour was screen-detected. The largest group of BC-SP invitees always participated in the CSP after receiving an invitation (n=47,087; 44.3%). About a quarter of the invited women never participated (n=26,783; 25.2%). Among the ‘always-attenders’, 1.6% (n=755) of the women were diagnosed with BC, compared with 6.8% (n=2,198) and 3.2% (n=867) of the ‘sometimes’ and ‘never-attenders’, respectively (Figure 1). A total of 61.9% (n=65,853) of the invitees were identified as ‘attenders’, hence 38.1% (n=40,524) as ‘non-attenders’. Non-attenders were found to be two years younger (MannWhitney U: p<.01). The number of BCs were evenly divided between the two attendancegroups (50.6% versus 49.4%). Women in the non-attenders group with BC, were two years younger (Mann-Whitney U: p<.01) and diagnosed with BC five years earlier in live (Mann-Whitney U: p<.01), compared to women with BC in the attenders’ group (Table 1). 3
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