Table 3.
Hazard ratios of 5-year breast cancer mortality associated with mammography screening among non-Hispanic white women: (a) ages 69–74; (b) ages 75–78; and (c) ages 79–84 years
| (a) 69–74 years (Group 1) | Dead (n=1,569) | Alive or Censored (n=23,127) | ||||
|---|---|---|---|---|---|---|
|
| ||||||
| n | % | N | % | HRa | 95% CIb | |
| Mammography screening | ||||||
| No/Irregular | 1061 | 67.6 | 8876 | 38.4 | 1.00 | (referent) |
| Biennial | 209 | 13.3 | 4179 | 18.1 | 0.50 | (0.43–0.58) |
| Annual | 299 | 19.1 | 10072 | 43.5 | 0.29 | (0.25–0.33) |
| p-value for trend | <0.0001 | |||||
| (b) 75–78 years (Group 2) | Dead (n=1,245) | Alive or Censored (n=15,304) | ||||
|---|---|---|---|---|---|---|
|
| ||||||
| N | % | n | % | HRa | 95% CIb | |
| Mammography screening | ||||||
| No/Irregular | 891 | 71.6 | 6415 | 41.9 | 1.00 | (referent) |
| Biennial | 150 | 12.1 | 2797 | 18.3 | 0.46 | (0.39–0.55) |
| Annual | 204 | 16.4 | 6092 | 39.8 | 0.28 | (0.24–0.32) |
| p-value for trend | <0.0001 | |||||
| (c) 79–84 years (Group 3) | Dead (n=1,823) | Alive or Censored (n=16,430) | ||||
|---|---|---|---|---|---|---|
| N | % | n | % | HRa | 95% CIb | |
|
| ||||||
| Mammography screening | ||||||
| No/Irregular | 1402 | 76.9 | 8189 | 49.9 | 1.00 | (referent) |
| Biennial | 168 | 9.2 | 2863 | 17.4 | 0.39 | (0.33–0.45) |
| Annual | 253 | 13.9 | 5378 | 32.7 | 0.29 | (0.25–0.33) |
| p-value for trend | <0.0001 | |||||
a
Hazard ratios adjusted for AJCC stage, radiation therapy, chemotherapy, co-morbid conditions and contextual socio-economic status.
b
95% Confidence interval.