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Direct linkNybacka, Ida; Simberg, Susanna; Santtila, Pekka; Sala, Eeva; Sandnabba, N. Kenneth – Journal of Speech, Language, and Hearing Research, 2012
Purpose: Recently, Simberg et al. (2009) found genetic effects on a composite variable consisting of 6 vocal symptom items measuring dysphonia. The purpose of the present study was to determine genetic and environmental effects on the individual vocal symptoms in a population-based sample of Finnish twins. Method: The sample comprised 1,728 twins…
Descriptors: Genetics, Environmental Influences, Twins, Voice Disorders
Simberg, Susanna; Santtila, Pekka; Soveri, Anna; Varjonen, Markus; Sala, Eeva; Sandnabba, N. Kenneth – Journal of Speech, Language, and Hearing Research, 2009
Purpose: To explore the existence of genetic effects as well as the interaction between potential genetic effects and a voice-demanding occupation on dysphonia. Method: One thousand seven hundred and twenty-eight Finnish twins (555 male; 1,173 female) born between 1961 and 1989 completed a questionnaire concerning vocal symptoms and occupation.…
Descriptors: Twins, Voice Disorders, Genetics, Factor Analysis
