Dan Olweus, Mona E Solberg, Kyrre Breivik
Long-term school-level effects of the Olweus Bullying Prevention Program (OBPP)
Scandinavian journal of psychology
identify possible correlation teachers vocal intensity noise classroom well vocal intensity symptoms vocal tract discomfort classes 27 elementary school teachers participated study used questionnaires vocal production condition teacher vocal tract discomfort scale vtd applied class properly calibrated noise meter used measuring noise classroom teachers vocal intensity moderate positive correlation vocal intensity noise also significant difference vtd scale teachers without vocal complaint classes compared separately occasions increase groups scores groups without complaints found association vocal tract symptoms classes frequency burning itching sore throat sensitive throat observed intensity symptoms significant sore throat itching feeling lump throat observed significant values vocal intensity frequency intensity symptoms sensitive throat lump throat class sore throat lump throat increase teachers vocal intensity correlates high noise levels classroom evidence suggests correlation vocal intensity discomfort vocal tract symptoms reported greater frequency intensity class