Muscle tension dysphonia (MTD) can masquerade as adductor spasmodic dysphonia (ADSD), leading to diagnostic confusion. An investigation assessed the diagnostic worth of acoustic analysis of phonatory breaks (PB) as a possible objective test to distinguish ADSD from MTD.
Acoustic Analysis of Phonatory Breaks to Test for ADSD and MTD (n=100)
Reference StandardTest OutcomeHas ADSDHas MTDPositive (PB≥40 ms)35
True Positive (TP)40
False Positive (FP) Negative (PB<40 ms)16
False Negative (FN)22
True Negative (TN)
Calculate the sensitivity, specificity, positive predictive value, and negative predictive value. Please interpret each result.