Table 1.

Breast cancer-specific survival by detection mode

	Person years	N totala	N breast cancer deaths (%)	HR adjusted for age (95% CI)	P-value
Screen-detected cancer	13,183	1257	149 (11.9)	1.00 (Ref.)
Interval cancer ≤24 months	5627	557	129 (23.2)	2.06 (1.62–2.61)	< 0.001
Interval cancer > 24 months	4299	604	154 (25.5)	3.00 (2.37–3.79)	< 0.001
Non-participant cancer	2097	324	104 (32.1)	4.18 (3.25–5.39)	< 0.001

^a Follow-up time of 11 participants was censored before the first death occurred in the stratum