The last complete census in Iraq conducted in 1997 found 4.05 million households in the country, a figure ORB used to calculate that approximately 1.03 million people had died as a result of the war.
The margin of error in the survey, conducted in August and September 2007, was 1.7 per cent, giving a range of deaths from 946,258 to 1.12 million people. The research covered 15 of Iraq's 18 provinces.
Those missing from the survey included two of Iraq's more dangerous regions, Kerbala and Anbar, and the northern province of Arbil, where local authorities refused the group a permit to work.
Tallys of civilians killed in Iraq since the US-led invasion have been controversial in the past.
The Iraq Body Count website estimates the number is under one million, but upwards of between 80,699 and 88,126 people, although US authorities have questioned the site's methodology and figures.
Those people killed and injured in Thursday's car bomb attack in Baghdad were passers-by in the street or in three cars that were damaged as they drove past the explosion, the Reuters news agency reported.
An Iraqi police officer, said the car was parked about 300 metres from a bus station but it exploded early in the day before passengers had started to arrive.
In another attack in Iraq, rockets slammed into a British base in Basra, in southern Iraq, killing at least 10 Iraqis outside the base and wounding three British soldiers.
Captain Finn Aldrich, a British military spokesman in Basra, said no major damage was reported on the base, but one of the rockets landed outside the entry gates for Iraqi civilian employees.
British troops retaliated, firing six artillery shells towards the launching points, Aldrich said.
Major Rafea al-Ajwadi, a Basra police chief, said the British artillery fire had hit a construction company, killing one employee and wounding five others.
Aldrich said joint British-Iraqi investigation was under way to determine whether the casualties found at the site of the artillery strikes were civilians or fighters, as well as other details about the attack.