Abstract
Dysarthrophonia is a predominant symptom in many neurological diseases, affecting the quality of life of the patients. In this study, we produced a discriminant function equation that can differentiate MS patients from healthy controls, using electroglottographic variables not analyzed in a previous study. We applied stepwise linear discriminant function analysis in order to produce a function and score derived from electroglottographic variables extracted from a previous study. The derived discriminant function’s statistical significance was determined via Wilk’s λ test (and the associated p value). Finally, a 2 × 2 confusion matrix was used to determine the function’s predictive accuracy, whereas the cross-validated predictive accuracy is estimated via the “leave-one-out” classification process. Discriminant function analysis (DFA) was used to create a linear function of continuous predictors. DFA produced the following model (Wilk’s λ = 0.043, χ2 = 388.588, p < 0.0001, Tables 3 and 4): D (MS vs controls) = 0.728*DQx1 mean monologue + 0.325*CQx monologue + 0.298*DFx1 90% range monologue + 0.443*DQx1 90% range reading − 1.490*DQx1 90% range monologue. The derived discriminant score (S1) was used subsequently in order to form the coordinates of a ROC curve. Thus, a cutoff score of − 0.788 for S1 corresponded to a perfect classification (100% sensitivity and 100% specificity, p = 1.67e−22). Consistent with previous findings, electroglottographic evaluation represents an easy to implement and potentially important assessment in MS patients, achieving adequate classification accuracy. Further evaluation is needed to determine its use as a biomarker.
Similar content being viewed by others
References
Beliavsky A, Perry JJ, Dowlatshahi D, Wasserman J, Sivilotti MLA, Sutherland J, Worster A, Émond M, Stotts G, Jin AY, Oczkowski WJ, Sahlas DJ, Murray HE, MacKey A, Verreault S, Wells GA, Stiell IG, Sharma M (2014) Acute isolated dysarthria is associated with a high risk of stroke. Cerebrovasc Dis Extra 4(2):182–185. https://doi.org/10.1159/000365169
Urban PP, Marx J, Hunsche S, Gawehn J, Vucurevic G, Wicht S, Massinger C, Stoeter P, Hopf HC (2003) Cerebellar speech representation: lesion topography in dysarthria as derived from cerebellar ischemia and functional magnetic resonance imaging. Arch Neurol 60(7):965–972. https://doi.org/10.1001/archneur.60.7.965
Urban PP, Rolke R, Wicht S, Keilmann A, Stoeter P, Hopf HC, Dieterich M (2006) Left-hemispheric dominance for articulation: a prospective study on acute ischaemic dysarthria at different localizations. Brain 129(3):767–777. https://doi.org/10.1093/brain/awh708
Konstantopoulos K, Vikelis M, Seikel JA, Mitsikostas DD (2010) The existence of phonatory instability in multiple sclerosis: an acoustic and electroglottographic study. Neurol Sci 31(3):259–268. https://doi.org/10.1007/s10072-009-0170-3
Midi I, Dogan M, Koseoglu M, Can G, Sehitoglu MA, Gunal DI (2008) Voice abnormalities and their relation with motor dysfunction in Parkinson’s disease. Acta Neurol Scand 117(1):26–34. https://doi.org/10.1111/j.1600-0404.2007.00965.x
Robert D, Pouget J, Giovanni A, Azulay JP, Triglia JM (1999) Quantitative voice analysis in the assessment of bulbar involvement in amyotrophic lateral sclerosis. Acta Otolaryngol 119(6):724–731
Konstantopoulos K, Christou YP, Vogazianos P, Zamba-Papanicolaou E, Kleopa KA (2017) A quantitative method for the assessment of dysarthrophonia in myasthenia gravis. J Neurol Sci 377:42–46. https://doi.org/10.1016/j.jns.2017.03.045
Fourcin AJ. Laryngographic assessment of phonatory function (1981). The American Speech-Language-Hearing Association, ASHA Reports: 116–127
Antonogeorgos G, Panagiotakos DB, Priftis KN, Tzonou A (2009). Logistic regression and linear discriminant analyses in evaluating factors associated with asthma prevalence among 10- to 12-years-old children: divergence and similarity of the two statistical methods. Int J Pediatr: 952042. https://doi.org/10.1155/2009/952042
Natsios G, Pastaka C, Vavougios G, Zarogiannis SG, Tsolaki V, Dimoulis A, Seitanidis G, Gourgoulianis KI (2016) Age, body mass index, and daytime and nocturnal hypoxia as predictors of hypertension in patients with obstructive sleep apnea. J Clin Hypertens (Greenwich) 18(2):146–152. https://doi.org/10.1111/jch.12645
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Vavougios, G.D., Doskas, T. & Konstantopoulos, K. An electroglottographical analysis-based discriminant function model differentiating multiple sclerosis patients from healthy controls. Neurol Sci 39, 847–850 (2018). https://doi.org/10.1007/s10072-018-3267-8
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10072-018-3267-8