This study has limitations that need to be considered for
the correct interpretation of our findings. This is not a randomized
trial; therefore, residual confounding is very likely
Conclusions regarding the degree of treatment effect should
be done with caution. Although there was a consistent pattern
of lower adjusted odds of bleeding throughout the study
with the use of fondaparinux comparedwithLMWH,thenumber
of bleeding events is likely an underestimate. Bleeding
events are often underreported in real-life health care and in
a registry.Furthermore, thedose and duration of fondaparinux
andLMWHwere not recorded.However, the study reflects the
situation when results from trials and practice guidelines are
translated into clinical reality.