Water and hygiene interventions to reduce diarrhoea in rural Afghanistan: a randomized controlled study.

A randomized controlled trial of four interventions was conducted using tubewells (n=2,486), liquid sodium hypochlorite ('Clorin') distributed with an improved water vessel (n=2,305), hygiene promotion (n=1,877), and a combination of the three (n=2,040) to create an evidence-base for water policy in Afghanistan. A fifth group served as a control (n=2,377). Interventions were randomized across 32 villages in Wardak province.