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Table 2 Strength of effectiveness evidence

From: Are interventions to reduce the impact of arsenic contamination of groundwater on human health in developing countries effective? A systematic review

Effectiveness evidence Definition
Excellent ≥95% of effluent water samples have arsenic concentrations below WHO guidelines
Good ≥95% of effluent water samples have arsenic concentrations below national guidelines*
Poor <95% of effluent water samples have arsenic concentrations below national guidelines*
Inconclusive Unable to comment on effectiveness evidence due to poor reporting of results
  1. * Note that the national guideline for As concentration in water is 0.05 mg/L for all of the countries included in this review.