Avtor/Urednik		Hočevar-Boltežar, Irena; Radšel-Burger, Zora; Žargi, Miha
Naslov		Instability of voice in adolescence: pathologic condition or normal developmental variation?
Tip		članek
Vir		J Pediatr
Vol. in št.		Letnik 130, št. 2
Leto izdaje		1997
Obseg		str. 185-90
Jezik		eng
Abstrakt		Objective: Pediatricions often send adolescents with dysphonia tothe otorhinolaryngologist's office to find the reason for their hoarseness. The aim of this study was to identifity the main characteristics of adolescent voice and to determinewhich characteristic (variable of voice analysis) can distinguish normal variations of voice development frompathologic disorders. Study design: On the basis of history, indirect laryngoscopy, and stroboscopy, 51 adolescents (22 boys, 29 girls) from age 10 to 17 years were divided into four subgroups: candidates for singing lessons without voice problems, subjects with mutation voice disorders, subjects with functional dysphonia, and subjects with vocal cord nodules. Voice analysis by Multi-Dimensional Voice Program (Kay Elementrics) evaluated the fundamental frequency, the variability of pitch and amplitude (loudness), and the presence of oise in the analyzed voice sample of each of the subjects. Data were analyzed with the SPSS+/PC Statistical Program. Results: All mean values of variables that describe variability of pitch and amplitude were abnormal in boys and in girsl, with greater abnormality among boys. The variability of loudness and specificially the variability of pitch were abnormal in a majority of subjects. A significant negative correlation between age and fundamental frequency was stated inboys only and between age and variability of amplitude ingirls only. Variables that express variability of pitch and amplitude correlated positively between themselves. No significant differences were found between the first subgroup (candidates for singing lessons), which represented a normal population, and the other three subgroups (subjects with mutational disorders,functional dysphnoia, and vocal cord nodules). (Abstract truncated at 2000 characters.)
Deskriptorji		VOICE VOICE DISORDERS SIGNAL PROCESSING, COMPUTER-ASSISTED LARYNGOSCOPY CHILD ADOLESCENCE REFERENCE VALUES ANALYSIS OF VARIANCE CHI-SQUARE DISTRIBUTION AGE FACTORS SEX FACTORS