title: [Conditional probability analysis between tinnitus and comorbidities in patients attending the National Rehabilitation Institute-LGII in the period 2012-2013].
abstract: BACKGROUND
  Tinnitus is defined as the conscious perception of a sensation of sound that occurs in the absence of an external stimulus. This audiological symptom affects 7% to 19% of the adult population. The aim of this study is to describe the associated comorbidities present in patients with tinnitus usingjoint and conditional probability analysis.
  
  
  METHODS
  Patients of both genders, diagnosed with unilateral or bilateral tinnitus, aged between 20 and 45 years, and had a full computerised medical record, were selected.
  
  
  METHODS
  Study groups were formed on the basis of the following clinical aspects: 1) audiological findings; 2) vestibular findings; 3) comorbidities such as, temporomandibular dysfunction, tubal dysfunction, otosclerosis and, 4) triggering factors of tinnitus noise exposure, respiratory tract infection, use of ototoxic and/or drugs.
  
  
  RESULTS
  Of the patients with tinnitus, 27 (65%) reported hearing loss, 11 (26.19%) temporomandibular dysfunction, and 11 (26.19%) with vestibular disorders. When performing the joint probability analysis, it was found that the probability that a patient with tinnitus having hearing loss was 2742 0.65, and 2042 0.47 for bilateral type. The result for P (A ∩ B)=30%. Bayes' theorem P (AiB) = P(Ai∩B)P(B) was used, and various probabilities were calculated. Therefore, in patients with temporomandibulardysfunction and vestibular disorders, a posterior probability of P (Aі/B)=31.44% was calculated.
  
  
  CONCLUSIONS
  Consideration should be given to the joint and conditional probability approach as tools for the study of different pathologies.
authors.affiliation: Servicio de Audiología, Instituto Nacional de Rehabilitación Luis Guillermo Ibarra Ibarra (INR-LGII), Ciudad de México, México.
authors.forename: Verónica
authors.initials: V
authors.lastname: Gómez Toledo
authors.affiliation: Servicio de Audiología, Instituto Nacional de Rehabilitación Luis Guillermo Ibarra Ibarra (INR-LGII), Ciudad de México, México.
authors.forename: Ileana
authors.initials: I
authors.lastname: Gutiérrez Farfán
authors.affiliation: Servicio de Neurobiología, Instituto Nacional de Rehabilitación Luis Guillermo Ibarra Ibarra (INR-LGII), Ciudad de México, México.
authors.forename: Antonio
authors.initials: A
authors.lastname: Verduzco-Mendoza
authors.affiliation: Servicio de Neurobiología, Instituto Nacional de Rehabilitación Luis Guillermo Ibarra Ibarra (INR-LGII), Ciudad de México, México. Electronic address: arch@terra.com.mx.
authors.forename: Emilio
authors.initials: E
authors.lastname: Arch-Tirado
mesh_terms: D000047:Academies and Institutes; D000328:Adult; D001499:Bayes Theorem; D015897:Comorbidity; D005260:Female; D034381:Hearing Loss / Q000453:epidemiology; D006801:Humans; D008297:Male; D008800:Mexico; D008875:Middle Aged; D009622:Noise / Q000009:adverse effects; D010040:Otosclerosis / Q000453:epidemiology; D013705:Temporomandibular Joint Disorders / Q000453:epidemiology; D014012:Tinnitus / Q000453:epidemiology* / Q000209:etiology; D015837:Vestibular Diseases / Q000453:epidemiology; D055815:Young Adult
keywords: Acúfeno; Análisis de probabilidad; Associated pathologies; Patologías asociadas; Probability analysis; Tinnitus