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KCE Reports 113 Volume Outcome 147
DESCRIPTION OF DIFFERENCES IN CHARACTERISTICS ACCORDING TO
THE VOLUME CATEGORY OF THE HOSPITAL
Table 6.18 shows the differences in case mix by volume of centres. The cut off of
volume (219 and 401) divide the 29 centres in three groups of equal size. These
thresholds correspond more or less to those used by the Agency for Healthcare
Research and Quality (upper threshold of 200 CABG per year) and by the Leapfrog
Group (450 CABG per year). 29, 126 More information on these international volume
thresholds is provided in the discussion section (page 151).
Age and gender are not associated with volume. There are, however, a higher
proportion of patients with a high Charlson score in low and medium volume centres.
This is confirmed by a higher proportion of patients with diabetes and renal disease in
these centres in comparison to high volume centres.
High volume centres perform more combined operations than low volume centres
(18% versus 12%).
Length of stay (LOS) was also longer in low volume centres (17.5 days) than in high
volume centres (15.1 days).
In-hospital mortality was inversely associated with the volume of centres: 6.7% in low
volume centres, 5.7% in medium volume centres and 3.6% in high volume centres.