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Table 2 Breast cancer-specific survival by breast density and mode of detection

From: Breast density and breast cancer-specific survival by detection mode

  Person years N totala N breast cancer deaths (%) HR adjusted for age (95% CI)b P-value HR adjusted for age and mode of detection (95% CI)b P-value
Overall
 Dense 9418 777 173 (22.3) 0.94 (0.77–1.15) 0.58 0.84 (0.68–1.03) 0.09
 Fatty 14,495 1456 306 (21.0) 1.00 (Ref.)   1.00 (Ref.)  
Screen-detected + Interval cancer ≤ 24 m
 Dense 7424 595 115 (19.3) 1.01 (0.78–1.31) 0.91   
 Fatty 10,995 995 162 (16.3) 1.00 (Ref.)    
Screen-detected cancer
 Dense 4329 340 44 (12.9) 0.77 (0.53–1.11) 0.16   
 Fatty 8589 760 105 (13.8) 1.00 (Ref.)    
Interval cancer ≤ 24 m
 Dense 3095 255 71 (27.8) 1.07 (0.74–1.56) 0.72   
 Fatty 2406 235 57 (24.3) 1.00 (Ref.)    
Interval cancer > 24 m
 Dense 1433 133 41 (30.8) 0.80 (0.53–1.20) 0.29   
 Fatty 2334 290 86 (29.7) 1.00 (Ref.)    
Non-participant cancer
 Dense 562 49 17 (34.7) 0.72 (0.40–1.31) 0.29   
 Fatty 1166 171 58 (33.9) 1.00 (Ref.)    
  1. a Follow-up time of several participants was censored before the first death occurred in the stratum. Overall: n = 4; Screen-detected+Interval cancer ≤24 m: n = 8; Screen-detected cancer: n = 5; Interval cancer ≤24 m: n = 4; Interval cancer > 24 m: n = 1; Non-participant cancer: n = 1