Assessing the impact of drinking water and sanitation on diarrhoeal disease in low- and middle-income settings: systematic review and meta-regression.

Improvements in drinking water and sanitation were associated with decreased risks of diarrhoea and Specific improvements, such as the use of water filters, provision of high-quality piped water and sewer connections, wereassociated with greater reductions in diarrhoeas compared with other interventions.