Table 1 Discharges with breast surgery (n), percentage of breast conserving surgery (BCS), Risk Ratios for BCS (RR) with 95% Confidence Intervals (CI) estimated by hierarchical log binomial regression.
n | BCS (%) | RR | CI | |
|---|---|---|---|---|
Age (yrs) | ||||
<50 | 3995 | 68 | ref | |
50–59 | 4260 | 70 | 1.04 | 1.02 – 1.07 |
60–69 | 4806 | 67 | 1.01 | 0.98 – 1.04 |
70+ | 5583 | 46 | 0.72 | 0.69 – 0.75 |
Severity of disease | ||||
Localized | 17145 | 63 | ref | |
Non-localized | 1499 | 47 | 0.73 | 0.69 – 0.77 |
Comorbidity index | ||||
0 | 17391 | 62 | ref | |
1+ | 1253 | 49 | 0.90 | 0.85 – 0.96 |
Hospital volume | ||||
<50 | 3249 | 52 | ref | |
50–100 | 5685 | 60 | 1.12 | 1.07 – 1.18 |
>100 | 9710 | 66 | 1.09 | 1.03 – 1.14 |
Calendar year | ||||
2000 | 3541 | 56 | ref | |
2001 | 3721 | 59 | 1.05 | 1.01 – 1.08 |
2002 | 3807 | 61 | 1.07 | 1.03 – 1.11 |
2003 | 3858 | 64 | 1.13 | 1.09 – 1.17 |
2004 | 3717 | 67 | 1.15 | 1.11 – 1.19 |