Fundamental frequency and sound pressure level of phonation in pathological states

The fundamental frequency (F₀) for the habitual pitch (F_0HAB), F₀ for the lowest physiological tone (F_0L), F₀ for the highest physiological tone (F_0H), F₀ range of phonation (F₀ Rg), sound pressure level (SPL) for habitual loudness (SPL_HAB), SPL for the softest tone (SPL_S), SPL for the loudest tone (SPL_L), and SPL range of phonation (SPL Rg) were measured in 40 normal adult subjects and 1,563 voice patients with varying diseases. F_0H, F₀ Rg, SPL_L, and SPL Rg were decreased in many disease groups. F_0HAB and F_0L varied. SPL_HAB and SPL_S were increased in some disease groups. F₀-related parameters reflected effects of treatments in the cases with polyp, Reinke's edema, epithelial hyperplasia, carcinoma, and paralysis. Effects of treatments were manifested in SPL-related parameters in the cases with nodule, polyp, carcinoma, and paralysis.