Table 2.
Age-specific incidence rates of invasive breast cancer and mortality rates from other causes (per 100,000 woman-years) in the Navarre Breast Cancer Screening Program cohort, 1996–1998 to 2005
| Age (years) | No. of woman-years | Invasive breast cancer | Death from other causes | ||||
|---|---|---|---|---|---|---|---|
| No. of cases | Baseline rate, NBCSP (95 % CI)a | External baseline rate, Navarreb | No. of deaths | Composite rate, NBCSP (95 % CI)c | External composite rate, Navarred | ||
| 45–49 | 32,116 | 49 | 111.3 (77.4–160.1) | 156.6 | 34 | 105.9 (75.6–148.2) | 115.2 |
| 50–54 | 96,663 | 185 | 138.9 (108.1–178.4) | 134.8 | 151 | 156.2 (133.2–183.2) | 166.6 |
| 55–59 | 100,953 | 202 | 144.0 (112.2–184.9) | 146.4 | 204 | 202.1 (176.2–231.8) | 239.7 |
| 60–64 | 86,085 | 193 | 160.4 (124.4–206.9) | 175.9 | 241 | 280.0 (246.8–317.6) | 327.8 |
| 65–69 | 77,621 | 166 | 152.8 (117.3–199.1) | 146.2 | 373 | 480.5 (434.2–531.9) | 619.5 |
| 70–74 | 27,362 | 40 | 104.3 (71.3–152.4) | 114.1 | 215 | 785.8 (687.4–898.1) | 1085.2 |
aBaseline incidence rates of invasive breast cancer and 95 % confidence intervals (CIs) for a woman at the reference level of all risk factors (age at menarche ≥14 years, no previous breast biopsy, age at first live birth <20 years, and no affected first-degree relatives) estimated from a piecewise exponential model in the Navarre Breast Cancer Screening Program (NBCSP) cohort
bExternal baseline incidence rates of invasive breast cancer for a woman at the reference level of all risk factors (age at menarche ≥14 years, no previous breast biopsy, age at first live birth <20 years, and no affected first-degree relatives) calculated as the composite incidence rates of invasive breast cancer for the period 2000–2004 obtained from the Navarre Cancer Registry multiplied by one minus the overall attributable risk estimated from the Navarre Breast Cancer Screening Program cohort
cComposite mortality rates from other causes and 95 % confidence intervals (CIs) among women in the Navarre Breast Cancer Screening Program (NBCSP) cohort
dExternal composite mortality rates from other causes in the entire female population of Navarre during the period 2000–2004 obtained from the Spanish National Institute of Statistics