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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.

From: Diffusion of good practices of care and decline of the association with case volume: the example of breast conserving surgery

  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