Among such "conservative assumptions" is the exclusion of data from Fallujah in many of its findings. Since interpreting the results of the study would be complicated by the inclusion of an outlier cluster in Fallujah, where heavy fighting caused far more casualties than elsewhere in Iraq, the study focused mainly on the results that excluded the Fallujah cluster. While the authors argued that the Fallujah cluster's inclusion could be justified as a normal part of the sampling strategy (the authors noted that other "hotspots" like Najaf had not ended up being surveyed), and the authors presented two sets of results in some cases (one set including the Fallujah data and one not), the article, and most press coverage of the article, stresses the data that excluded the Fallujah cluster.