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Table 5 Pre- and posttreatment acoustic parameters assessment in LPR patient groups (patients with roughness vs. patients without roughness; mean and inter-quartile values)

From: Impact of laryngopharyngeal reflux on subjective and objective voice assessments: a prospective study

    Patients with roughness (n = 15)
A. Parameters ULNR♯ pretreatment posttreatment Z p-value*
STD 2.04 3.94 ± 2.14 2.76 ± 1.48 −1.14 0.258
vF0 1.10 2.32 ± 1.13 1.74 ± 0.88 −0.97 0.334
Jitt 0.61 1.60 ± 1.17 1.02 ± 0.75 −1.36 0.173
RAP 0.36 0.92 ± 0.67 0.59 ± 0.50 −1.59 0.112
PPQ 0.35 0.91 ± 0.72 0.61 ± 0.40 −1.36 0.173
PFR 2.17 3.67 ± 2.00 2.73 ± 1.00 −1.48 0.358
Shim 2.26 6.06 ± 4.23 4.03 ± 2.78 −2.78 0.005
APQ 1.69 5.27 ± 3.85 3.44 ± 2.17 −2.33 0.020
vAm 9.23 15.73 ± 8.62 12.84 ± 4.14 −1.02 0.307
NHR 0.12 0.14 ± 0.04 0.13 ± 0.04 −1.25 0.211
  1. *Wilcoxon matched-pairs signed-ranks test; Acoustic parameters (A. parameters), Jitter percent (Jitt), Relative Average Perturbation (RAP), Pitch Perturbation Quotient (PPQ), Fundamental frequency variation (vF0), Shimmer percent (Shim), Amplitude Perturbation Quotient (APQ), Peak-to-Peak Amplitude Variation (vAm), and Noise Harmonic Ratio (NHR). ULNR: Upper Limit of N Range, ♯ = based on the MDVP norms