The team identified the proportion of households in which soap and water was present at a hand washing place in the home. They found the availability of soap anywhere in the dwelling ranged from nearly 21 per cent in Senegal to 99.1 percent in Iraq and Serbia, according to the surveys that included data on soap availability in the home.
In Africa, the proportions of households with soap and water at a hand washing place range from as low as 0.1 per cent in Ethiopia to a high of 34.7 per cent in Swaziland, researchers said.
They also found that compared to Africa, the availability of soap and water was higher in the Eastern Mediterranean region, and ranged from 42.6 per cent in Afghanistan to 91.5 per cent in Iraq.
In Southeast Asia, nearly 79 per cent of households in Bhutan had soap and water, compared to 21.4 per cent in Bangladesh, researchers said.
"These data is useful to public health programs and policy makers because they underscore the deep inequities that persist globally and within countries, contributing to these preventable child deaths among people living in poverty and in rural areas in sub-Saharan Africa and South Asia," said Pavani Ram from University of Buffalo.
The findings underscore the need to improve access to soap, along with hand washing behaviour in general, in many impoverished countries, said Swapna Kumar from University of Buffalo.
The study was published in the American Journal of Tropical Medicine and Hygiene.
Follow NDTV for latest election news and live coverage of assembly elections 2019 in Maharashtra and Haryana.
Subscribe to our YouTube channel, like us on Facebook or follow us on Twitter and Instagram for latest news and live news updates.