Reducing children's exposure to secondhand smoke at home: a randomized trial

Area of Science:

• Public Health
• Environmental Health
• Pediatrics

Background:

• Secondhand smoke (SHS) exposure poses significant health risks to children.
• Home environment is a primary source of SHS exposure for young children.
• Effective interventions are needed to protect children from SHS in residential settings.

Purpose of the Study:

• To develop and evaluate an intensive intervention aimed at reducing children's SHS exposure in homes.
• To compare the effectiveness of an intensive intervention versus a minimal intervention in a randomized trial.
• To assess changes in children's SHS exposure biomarkers and parental knowledge.

Main Methods:

• A single-blind, randomized trial involving 250 households with children aged 2-6 years in Yerevan, Armenia.
• Intervention group received counseling, educational brochures, home air pollution demonstration, and follow-up calls.
• Control group received standard leaflets; biomonitoring (hair nicotine) and surveys were conducted at baseline and 4-month follow-up.

Main Results:

• The intensive intervention significantly decreased children's hair nicotine levels (0.30 to 0.23 ng/mg, P=.024).
• While hair nicotine was 17% lower in the intervention group, this difference was not statistically significant (P=.239).
• Mothers' knowledge scores significantly increased in the intervention group (P=.006), and smoking restrictions rose in both groups.

Conclusions:

• Intensive intervention effectively educates mothers and promotes home smoking restrictions, leading to decreased children's SHS exposure.
• The intervention demonstrated a positive impact on reducing exposure biomarkers and increasing parental knowledge.
• While promising, the study did not achieve statistically significant superiority over minimal intervention in reducing children's SHS exposure.