The study results show an increasing mortality rate throughout the post-invasion periods, with the excess mortality rate for June 2005-June 2006 of 14.2 (95% CI, 8.6-21.5) being nearly 5.5 times the excess mortality rate for March 2003-April 2004 of 2.6 (95% CI, 0.6-4.7). The 2006 study also provides an estimate for the 18-month period following the invasion (March 2003 through September 2004) of 112,000 deaths (95% CI, 69,000-155,000). The authors conclude, "Thus, the data presented here validates our 2004 study, which conservatively estimated an excess mortality of nearly 100,000 as of September, 2004."