title: [Hearing the impact of MP3 on a survey of middle school students].
abstract: OBJECTIVE
  To understand the usage of MP3 and effects on hearing of middle school students in Xi'an, and discuss controlling strategies.
  
  
  METHODS
  Stratified random cluster sampling method was used in the 1567 middle school students in Xi'an through questionnaire survey, ear examination and hearing examination, data were analysed by the SPSS13.0 statistical software.
  
  
  RESULTS
  1) The rate of holding MP3 in the middle school students was 85.2%. Average daily use time was (1.41 +/- 1.11) h. 2) The noise group of pure tone hearing threshold was significantly higher compared with the control group (P<0.01), and increased the detection rate of hearing loss with the increasing use of MP3. 3) The detection rate of symptoms increased with the increasing use of MP3.
  
  
  CONCLUSIONS
  The usage of MP3 can harm hearing in middle school students, which can result in neurasthenic syndrome.
authors.affiliation: Department of Otolaryngology, the First People's Hospital of Yongkang, Zhejiang Province, Yongkang, 321300, China.
authors.forename: Zhan
authors.initials: Z
authors.lastname: Xu
authors.forename: Zonghua
authors.initials: Z
authors.lastname: Li
authors.forename: Yang
authors.initials: Y
authors.lastname: Chen
authors.forename: Ya
authors.initials: Y
authors.lastname: He
authors.forename: Xiujie
authors.initials: X
authors.lastname: Chunyu
authors.forename: Fangyuan
authors.initials: F
authors.lastname: Wang
authors.forename: Pengzhi
authors.initials: P
authors.lastname: Zhang
authors.forename: Lei
authors.initials: L
authors.lastname: Gao
authors.forename: Shuping
authors.initials: S
authors.lastname: Qiu
authors.forename: Shunli
authors.initials: S
authors.lastname: Liu
authors.forename: Li
authors.initials: L
authors.lastname: Qiao
authors.forename: Jianhua
authors.initials: J
authors.lastname: Qiu
mesh_terms: D000293:Adolescent; D001301:Audiometry, Pure-Tone; D001309:Auditory Threshold; D003625:Data Collection; D005260:Female; D034381:Hearing Loss / Q000209:etiology*; D006320:Hearing Tests; D006801:Humans; D055539:MP3-Player; D008297:Male; D013334:Students; D011795:Surveys and Questionnaires