Study	Reason for exclusion
Bailey 1991	The study was an observational study (case‐control), thus not a controlled clinical/community trial
Esrey 1991	The paper was a 'traditional' review/overview of studies relating to improved water supply and sanitation
Potter 1993	The article was an editorial of the BMJ, not a controlled trial
Pruss 2000	The article was a review of studies relating to environmental sanitary interventions
Sutter 1983	The allocation of intervention and control villages was decided long after intervention had started. Thus it was not a controlled trial
Taylor 2002	The article was an editorial not a study/clinical trial
West 1988	The article was a review/overview of community intervention programs for trachoma control; it was not a clinical/community trial
West 1989	The study was an observational survey (cross‐sectional study), not a controlled clinical trial
West 1996	The intervention in this community based clinical trial was face washing, not environmental sanitary measures (as defined in the review)