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Table 2 Pre- and posttreatment acoustic parameter assessment in LPR patients (mean ± inter-quartile values)

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

Acoustic Parameters ULNR♯ pretreatment posttreatment Z p-value*
STD 2.04 3.16 ± 2.38 2.59 ± 1.76 −1.34 0.180
vF0 1.10 1.92 ± 1.05 1.59 ± 0.92 −1.19 0.236
Jitt 0.61 1.42 ± 1.10 1.12 ± 1.10 −2.08 0.038
RAP 0.36 0.84 ± 0.65 0.67 ± 0.55 −2.01 0.044
PPQ 0.35 0.84 ± 0.66 0.68 ± 0.52 −1.94 0.053
PFR 2.17 3.10 ± 2.00 2.66 ± 1.00 −1.72 0.084
Shim 2.26 5.14 ± 2.90 4.12 ± 2.30 −2.73 0.006
APQ 1.69 4.35 ± 2.20 3.31 ± 1.82 −3.00 0.003
vAm 9.23 13.75 ± 9.60 13.30 ± 6.58 −0.84 0.403
NHR 0.12 0.14 ± 0.40 0.13 ± 0.03 −0.33 0.741
  1. *Wilcoxon matched-pairs signed-ranks test. ULNR: Upper Limit of N Range, ♯ = based on the MDVP® norms