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Table 4 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 without roughness (n = 26)
A. Parameters ULNR♯ pretreatment posttreatment Z p-value*
STD 2.04 2.70 ± 1.60 2.49 ± 2.47 −0.85 0.395
vF0 1.10 1.69 ± 1.17 1.50 ± 1.18 −0.90 0.367
Jitt 0.61 1.34 ± 1.43 1.19 ± 1.37 −1.46 0.144
RAP 0.36 0.79 ± 0.71 0.71 ± 0.75 −1.26 0.209
PPQ 0.35 0.79 ± 0.65 0.71 ± 0.64 −1.33 0.182
PFR 2.17 2.77 ± 1.50 2.62 ± 1.00 −0.92 0.358
Shim 2.26 4.61 ± 1.92 4.17 ± 2.96 −1.05 0.292
APQ 1.69 3.81 ± 1.53 3.24 ± 2.88 −1.90 0.058
vAm 9.23 12.60 ± 11.93 13.56 ± 9.50 −0.16 0.869
NHR 0.12 0.13 ± 0.04 0.13 ± 0.03 −0.63 0.525
  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