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Table 3 Data in tertiles over three-year period.*

From: Initial experience with off-pump left ventricular assist device implantation in single center: retrospective analysis

Year of OP LVAD Number of deaths at 1 year postoperative/Total Percent of death
2004-2005 3/6 50%
2006 4/12 33%
2007 1/6 17%
  1. *The total study was divided into three tertiles (2004-2005, 2006, and 2007). There is a trend of decreased death from 50% to 17% over a one-year period, reflecting progressive improvement in the perioperative experience of OP LVAD insertion with reduced postoperative mortality rate. The trend is not statistically significant (p = 0.08 Fisher' exact test) due to the limited sample size.