Evaluating the implementation fidelity of a community-based intervention to promote hearing conservation among farm and rural youth.

Noise-induced hearing loss is common among farm and rural youth. There is a lack of programs preparing this high-risk population to use hearing conservation strategies. Safety Days are 1-day workshops that teach 100,000 rural children safe farm practices in 400 sites across the USA annually. As part of a larger study for fourth graders, a hearing conservation lesson was delivered at 25 sites nationwide. However, the fidelity to the study-designed curriculum and quality of instruction was unknown. We examined whether community volunteers are capable of delivering, with adequate fidelity and quality, a planned intervention designed to increase use of hearing conservation strategies among farm and rural youth. We invited instructors (n = 22) to deliver a health lesson to fourth graders and provide lesson recordings. We developed instruments rating (i) fidelity of the teaching to the curriculum and (ii) quality of instruction. Initial instruments were modified based on the review for clarity, relevance, and conceptual fit; inter-rater reliabilities were .90 (content fidelity) and 1.00 (quality of instruction). Of seven recordings reviewed, mean fidelity to the planned curriculum was 1.51 (max score = 2), with nearly four fifths of lesson items fully addressed. Overall mean of rating of quality of instruction was 1.97 (out of 2). Fidelity to both content and quality of instruction was high. Results provide a model and support for use of community volunteers (with no special educational or experiential background) and fidelity testing as cost-effective strategies to provide sustainable programming for hearing conservation among farm and rural youth.