The Added Value of Water, Sanitation, and Hygiene Interventions to Mass Drug Administration for Reducing the Prevalence of Trachoma: A Systematic Review Examining

Table 5

Methodological evaluation of the quality of included studies.

Quality of evidence	Cumberland et al., 2008 [13]	Khandekar et al., 2006 [14]	Lansingh et al., 2010 [15]
Selection bias
Random sampling	Yes	Yes	Yes
Sample size	N/A	Yes	No
Comparability	No	Yes	Yes
Compliance
“A” coverage (over 80%)	Yes	N/A	No
“F” and “E”	Yes	Yes	Yes
Confounders
Descriptive variables	No	Yes	No
Climate	No	Yes	Yes
Masking	No	Yes	No
Applicability	Yes	Yes	No