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The effect of a booster intervention to promote hearing protection behavior in operating engineers
Oisaeng Hong1, Dal Lae Chin, Lauren A Fiola
1School of Nursing, University of California San Francisco, San Francisco, California 94143-0608, USA. oisaeng.hong@nursing.ucsf.edu
Background:
Booster interventions may be useful in promoting workers' hearing protection device (HPD) use. Previous research on the effectiveness and the optimal timeframe for boosters is limited and inconsistent.
Methods:
In this randomized controlled trial, 403 workers were assigned to receive an individually tailored booster, a control booster, or no booster. The booster intervention groups were further divided by timeframe. Frequency of HPD use was measured 12 months post-intervention.
Results:
The booster intervention groups significantly accounted for the variance in HPD use in Year 2. Workers in middle-term booster (67-94 days) group reported a significantly greater increase in HPD use in Year 2 than those in other timeframes, when potential covariates were controlled for.
Conclusions:
Booster intervention letters mailed between 67 and 94 days post-initial intervention may promote HPD use among participants. Future research should explore additional factors associated with optimal booster design, including more innovative mobile and internet-based approaches.