Abstract
Background/Objectives: The voice is often perceived as a natural and spontaneous means of communication, but it involves complex interactions among physiological, psychological, and environmental factors. For teachers, whose profession relies heavily on vocal use, understanding and managing vocal strain is crucial. This study investigates the correlation between ambient noise levels in classrooms and teachers' self-assessed voice-related quality of life, as measured by the Voice Handicap Index (VHI). The focus is on how classroom acoustics affect vocal health, considering the high incidence of vocal fatigue among educators. Methods: A pilot exploratory study was conducted from September 2022 to November 2022 involving four primary school teachers (two language and two science) from an Italian primary school. Classroom noise levels were recorded using the "Listen Responsibly" app at intervals during lessons. Following each lesson, teachers completed the VHI questionnaire to evaluate their voice-related quality of life. Statistical analyses included simple and multiple linear regressions, logistic regression, and Spearman's correlation to assess the relationships between noise levels and VHI scores. Results: The study yielded 60 observations categorized into VHI Grade 1 (0-30) and Grade 2 (31-60). Significant differences were observed in average noise levels between these groups, with Grade 2 exhibiting higher noise levels (p < 0.0001). Simple and multiple linear regression analyses confirmed a positive correlation between average recorded noise and VHI scores, with each unit increase in noise associated with a 0.72 unit increase in VHI score (p < 0.0001). Logistic regression identified average recorded noise > 59.5 dB as a significant predictor of higher VHI grades (p < 0.0001). Spearman's correlation confirmed a strong positive correlation (ρ = 0.77, p < 0.01). Conclusions: The study demonstrates a significant relationship between increased classroom noise levels and worse voice-related quality of life among teachers. These findings highlight the need for improved acoustic management in schools to reduce vocal strain. Implementing noise reduction strategies and enhancing classroom acoustics can help mitigate vocal health issues among educators, ultimately improving their professional and personal well-being.