. 2020 Nov 23;124(4):736–743. doi: 10.1038/s41416-020-01163-2

Table 3.

Results of the matched logistic regressions evaluating the association between time since last screening attendance and breast cancer mortality.

Exposure	Category of exposure	Controls (n = 15,202)	Cases (n = 8288)	OR (95% CI)	OR (95% CI) corrected for self-selection^a	OR (95% CI) corrected for self-selection^b
Time between last screen and diagnosis/pseudodiagnosis	Never screened	1803	1741	1.00	–	–
	0 ≤ 3 months	925	1383	1.50 (1.33–1.70)	1.93 (1.68–2.22)	1.91 (1.64–2.24)
	3 ≤ 12 months	2172	407	0.15 (0.13–0.18)	0.19 (0.17–0.23)	0.19 (0.15–0.24)
	12 ≤ 24 months	2573	788	0.24 (0.22–0.27)	0.31 (0.27–0.35)	0.31 (0.26–0.36)
	24 ≤ 36 months	2345	992	0.35 (0.32–0.40)	0.45 (0.39–0.51)	0.45 (0.38–0.52)
	36 ≤ 48 months	639	344	0.49 (0.42–0.57)	0.61 (0.51–0.73)	0.63 (0.52–0.75)
	48 ≤ 60 months	429	245	0.54 (0.45–0.66)	0.70 (0.57–0.86)	0.69 (0.55–0.86)
	>60 months	4316	2388	0.67 (0.60–0.74)	0.85 (0.75–0.96)	0.86 (0.74–0.99)

^aSelf-selection correction performed using our first method (variant of Duffy et al.¹⁵), with the OR of 0.78 associated with participation in cervical screening.

^bSelf-selection correction performed using our second method (Duffy et al.¹⁵).