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) |