What did the review of global data reveal?

(9)Access to clean water and soap not only improves hygiene but may boost growth in young children, research suggests. A review of global data found evidence of a small increase in height—about 0. 5cm—in under fives living in households with good sanitation. The studies took place in Bangladesh, Ethiopia, Nigeria, Chile, Guatemala, Pakistan, Nepal, South Africa, Kenya and Cambodia.
    Dr. Alan Dangour, a public health nutritionist who led the studies, said providing clean water, sanitation and hygiene is an effective way to reduce deaths from symptoms such as diarrhea.(10)"What we’ve found by bringing together all of the evidence for the first time is that there is a suggestion that these interventions improve the growth of children and that’s very important," he told BBC News. He said there is a clear link between dirty water, diarrhea and poor growth outcomes, because repeated illnesses in early childhood can affect growth.