Hand washing promotion for preventing diarrhoea

Area of Science:

• Public Health
• Infectious Disease Prevention
• Hygiene Interventions

Background:

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

Purpose of the Study:

• To evaluate the impact of hand washing promotion interventions on the incidence of diarrhoeal episodes in children and adults.
• To synthesize evidence from randomized controlled trials (RCTs) on the effectiveness of hand washing interventions.

Main Methods:

• A comprehensive systematic review and meta-analysis of individually randomized controlled trials (RCTs) and cluster-RCTs.
• Searched multiple databases including Cochrane, MEDLINE, EMBASE, LILACS, PsycINFO, and contacted researchers.
• Analyses stratified by setting (child day-care, community, hospital) and used random-effects models with GRADE assessment for evidence quality.

Main Results:

• Hand washing promotion reduced diarrhoea episodes by approximately 30% in child day-care centres in high-income countries (rate ratio 0.70) and communities in LMICs (rate ratio 0.72).
• Provision of soap alongside education in LMIC communities showed a larger effect (rate ratio 0.66) compared to education alone (rate ratio 0.84).
• A single hospital-based trial showed a significant reduction in diarrhoea episodes and increased hand washing frequency among high-risk individuals.

Conclusions:

• Hand washing promotion is effective in reducing diarrhoea episodes in childcare facilities and communities, particularly in LMICs.
• The effectiveness is enhanced when soap is provided with hygiene education.
• Further research is needed to understand how to promote sustained hand washing behaviours long-term.