Hand-washing promotion for preventing diarrhoea

Area of Science:

• Public Health
• Infectious Disease Prevention
• Epidemiology

Background:

• Diarrhoea is a major cause of child mortality in low- and middle-income countries (LMICs), accounting for 1.8 million deaths.
• Hand washing is a recognized strategy for preventing diarrhoeal diseases.

Purpose of the Study:

• To evaluate the effectiveness of hand-washing promotion interventions in reducing diarrhoeal episodes.
• To assess the impact on both children and adults across various settings.

Main Methods:

• Systematic review and meta-analysis of 29 randomized controlled trials (RCTs), including individually-randomized and cluster-RCTs.
• Studies were stratified by setting: child day-care centres/schools, communities, and hospitals.
• Incidence rate ratios (IRRs) were pooled using a random-effects model; certainty of evidence was assessed using the GRADE approach.

Main Results:

• Hand-washing promotion reduced diarrhoea episodes by approximately 30% in child day-care centres (high-income countries) and communities (LMICs).
• Provision of soap alongside education showed a larger effect size than education alone in community settings.
• A hospital-based trial demonstrated a significant reduction in diarrhoea episodes and increased hand-washing frequency.

Conclusions:

• Hand-washing promotion is an effective intervention for reducing diarrhoea episodes in child day-care centres and communities in LMICs.
• The findings suggest a public health benefit of approximately 30% reduction in diarrhoea episodes.
• Evidence on the long-term impact and cost-effectiveness of hand-washing interventions is currently lacking.