Quantifying the Occupational Voice Use of Teachers.

The sample was small and convenience based, with 26 female teachers only, so it may not represent male teachers, college professors, private voice teachers, or teachers in other settings. The study included 14 teachers with voice disorders and 12 vocally healthy teachers, but it was not designed to test whether voice disorder status affects vocal dose. Work hours were not individually tracked; the study defined work as 9:00 a.m. to 2:30 p.m. on weekdays, so extra duties or outside jobs may have been missed. Participants were monitored in the Boston metropolitan area, and the paper notes that location and teaching duties vary across studies. The average workday phonation time was lower than many earlier teacher studies, and the authors note that voice activity detection settings and technology differences may contribute. The study did not test an intervention or outcome, so it cannot show that monitoring or prevention advice changes voice health.

The only conflict statement given is that Robert E. Hillman and Daryush D. Mehta have financial interests in InnoVoyce LLC, a company focused on voice monitoring.

Do not conclude that teachers with voice disorders have a higher vocal load than healthy teachers. The ambulatory measures showed no statistically significant difference between the groups, t(26)=0.91, p=.36.