On Friday, 14 September 2007, ORB International, an independent polling agency located in London, published estimates of the total war casualties in Iraq since the US-led invasion of Iraq in 2003. At over 1.2 million deaths (1,220,580), this estimate is the highest number published so far. From the poll margin of error of +/-2.5% ORB calculated a range of 733,158 to 1,446,063 deaths. The ORB estimate was performed by a random survey of 1,720 adults aged 18+, out of which 1,499 responded, in fifteen of the eighteen governorates within Iraq, between August 12 and August 19, 2007. In comparison, the 2006 "Lancet" survey suggested almost half this number (654,965 deaths) through the end of June 2006. The "Lancet" authors calculated a range of 392,979 to 942,636 deaths.