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

Table 4 Pre- and posttreatment acoustic parameters assessment in LPR patient groups (patients with roughness vs. patients without roughness; mean and inter-quartile values)

		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

*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

ISSN: 1916-0216