Table 3.

Breast cancer–specific MRRs comparing older with younger age at diagnosis by decade and dichotomized at age 50, California, 2005–2014

Age groupNumber of deaths due to breast cancerMRR (95% CI)aMRR (95% CI)b
18–397231.70 (1.56–1.86)1.20 (1.10–1.32)
40–491,513ReferentReferent
50–591,9290.95 (0.88–1.01)1.06 (0.99–1.14)
60–691,5840.83 (0.77–0.89)1.12 (1.04–1.21)
70–791,3171.09 (1.02–1.18)1.56 (1.43–1.69)
80+1,4032.41 (2.24–2.59)3.25 (2.98–3.55)
18–492,236ReferentReferent
50+6,2330.94 (0.90–0.99)1.17 (1.11–1.23)
  • aAdjusted for year of diagnosis.

  • bStratified by AJCC stage, and adjusted for year of diagnosis, marital status, race/ethnicity, insurance status, neighborhood SES, lymph node involvement, tumor subtype, tumor size, tumor grade, tumor histology, guideline-concordant treatment, NCICC, and clustering by block group.