A randomised controlled trial of a complex intervention to reduce children’s exposure to secondhand smoke in the home.

Exposing children to secondhand tobacco smoke (SHS) causes significant harm and occurs predominantly through smoking by caregivers in the family home. Researchers from UKCTAS at the University of Nottingham trialed a complex intervention designed to reduce secondhand smoke exposure of children whose primary caregiver feels unable or unwilling to quit smoking.

This was an open-label, parallel, randomised controlled trial carried out in deprived communities around Nottingham City and County.

The trial worked with caregivers who live in Nottingham City and County in England who were at least 18 years old, the main caregiver of a child aged under 5 years living in their household, and reported that they were smoking tobacco inside their home.

The research compared a complex intervention that combined personalised feedback on home air quality, behavioural support and nicotine replacement therapy for temporary abstinence with usual care.

The primary outcome was change in air quality in the home, measured as average 16–24 hours levels of particulate matter of <2.5 µm diameter (PM2.5), between baseline and 12 weeks. Secondary outcomes included changes in maximum PM2.5, proportion of time PM2.5 exceeded WHO recommended levels of maximum exposure of 25 µg/mg3, child salivary cotinine, caregivers’ cigarette consumption, nicotine dependence, determination to stop smoking, quit attempts and quitting altogether during the intervention.

Geometric mean PM2.5 decreased significantly more (by 35.2%; 95% CI 12.7% to 51.9%) in intervention than in usual care households, as did the proportion of time PM2.5 exceeded 25 µg/mg3, child salivary cotinine concentrations, caregivers’ cigarette consumption in the home, nicotine dependence, determination to quit and likelihood of having made a quit attempt.

The team concluded that by reducing exposure to SHS in the homes of children who live with smokers unable or unwilling to quit, this intervention offers huge potential to reduce children’s’ tobacco-related harm.

Read the full research report in the BMJ here.

This trial was funded by the UK National Institute for Health Research.

To find more information about this trial and the Smoke Free Homes project click here.

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