title: Association between asthma and dysphonia: A population-based study.
abstract: We investigated whether asthma predisposes patients to organic laryngeal lesions or increases dysphonia in those without organic laryngeal lesions.
  
  
  
  We performed a cross-sectional study with data from the Korea National Health and Nutrition Examination Survey; 19,330 subjects from 2008 through 2011 were included. The associations of asthma with organic laryngeal lesions and dysphonia were analyzed using a simple/multiple logistic regression analysis with complex sampling while adjusting for confounding factors (age, sex, smoking status, stress level, and body mass index) that could contribute to dysphonia.
  
  
  
  Compared with non-asthma participants, the asthma patients tended to be older and female and to have higher stress levels. These factors were associated with dysphonia (Age, AOR = 1.20, 95% CI = 1.14 = 1.23, P < 0.001; female, AOR = 1.70, 95% CI = 1.33-2.17, P < 0.001; higher stress, AOR = 1.44, 95% CI = 1.23-1.69, P < 0.001). Asthma itself was also associated with dysphonia. Compared with non-asthma participants, asthma patients who had not taken asthma medication recently showed a higher AOR (1.62; 95% CI = 1.0-2.42) for dysphonia, and asthma patients who had taken asthma medication recently showed the highest adjusted odds ratio for dysphonia (AOR = 1.97; 95% confidence interval, CI = 1.28-3.02, P = 0.001). On multiple logistic regression analysis, vocal nodules, laryngeal polyps, and laryngitis were not associated with asthma (all P > 0.05).
  
  
  
  Asthma patients are predisposed to subjective dysphonia due to demographic and clinical characteristics (older age, female, and higher stress level) as well as to asthma itself. However, asthma was not associated with organic laryngeal lesions in this study.
authors.affiliation: a Department of Otorhinolaryngology-Head & Neck Surgery , Hallym University College of Medicine , Anyang , Korea.
authors.forename: Bumjung
authors.initials: B
authors.lastname: Park
authors.affiliation: a Department of Otorhinolaryngology-Head & Neck Surgery , Hallym University College of Medicine , Anyang , Korea.
authors.forename: Hyo Geun
authors.initials: HG
authors.lastname: Choi
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D001249:Asthma / Q000453:epidemiology*; D015992:Body Mass Index; D003430:Cross-Sectional Studies; D055154:Dysphonia / Q000453:epidemiology*; D005260:Female; D006801:Humans; D007818:Laryngeal Diseases / Q000453:epidemiology; D008297:Male; D008875:Middle Aged; D016017:Odds Ratio; D056910:Republic of Korea / Q000453:epidemiology; D012307:Risk Factors; D012737:Sex Factors; D012907:Smoking / Q000453:epidemiology; D013315:Stress, Psychological / Q000453:epidemiology; D055815:Young Adult
keywords: Asthma; dysphonia; epidemiology; laryngitis; larynx; vocal cord dysfunction; vocal cord paralysis; voice