title: Standardization of acoustic measures for normal voice patterns.
abstract: Studies have established that normative data is necessary for acoustic analysis. The aim of the present study is to standardize fundamental frequency measures (fo), jitter, shimmer and harmonic-noise ratio (HNR) for young adults with normal voice.
  
  
  METHODS
  20 males and 20 females, between 20 and 45 years, without signs and symptoms of vocal problems; CSL-4300 Kay-Elemetrics; vowels /a/ and /é/.
  
  
  RESULTS
  for females, vowels /a/ and /é/ had average measures of: fo 205.82 Hz and 206.56 Hz; jitter of 0.62% and 0.59%; shimmer of 0.22 dB and 0.19 dB; PHR of 10.9 dB and 11.04 dB, respectively. For males, vowel /a/ and /é/ had average measures of: fo 119.84 Hz and 118.92 Hz; jitter of 0.49% and 0.5%; shimmer of 0.22 dB and 0.21 dB; HNR 9.56 dB and 9.63 dB, respectively. Both fo and NHR female measures were significantly higher than their male counterparts.
  
  
  CONCLUSIONS
  our results differ from the literature; therefore, it is important to standardize the program in use.
authors.affiliation: FFCLRP, USP, UNAERP, Brazil. anaedufelippe@netsite.com.br
authors.forename: Ana Clara
authors.initials: AC
authors.lastname: Naufel de Felippe
authors.forename: Maria Helena Marotti Martelletti
authors.initials: MH
authors.lastname: Grillo
authors.forename: Thaís Helena
authors.initials: TH
authors.lastname: Grechi
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012016:Reference Values; D012737:Sex Factors; D013061:Speech Acoustics; D013068:Speech Production Measurement / Q000592:standards*; D014831:Voice / Q000502:physiology*; D014833:Voice Quality