ses and relative risk (RR) with 95% confidence interval (CI) of female breast cancer by age at diagnosis 0 E RR (CI) Age at diagnosis 1-44 years 12 8.2 1.5 (0.8-2.6) 45 -54 years 17 12.1 1.4 (0.8-2.3) 55+years 12 11.8 1.0 (0.5-1.8) Total 41 32.0 1.3 (0.9- 1.7) associations that are only marginally significant, or which have a wide confidence interval or are based on only a few observed cases, should be interpreted with caution.
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