Birth control pills and nonprofessional voice: Acoustic analyses

Ofer Amir*, Tal Biron-Shental, Esther Shabtai

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


Purpose: Two studies are presented here. Study 1 was aimed at evaluating whether the voice characteristics of women who use birth control pills that contain different progestins differ from the voice characteristics of a control group. Study 2 presents a meta-analysis that combined the results of Study 1 with those from 3 recent studies that compared voices of women who use and do not use birth control pills. Method: In Study 1, voice samples from 30 women with no history of voice training, who use pills with different progestins (drospirenone, desogestrel, gestodene), and 10 women who do not use the pill were recorded at specific time points across the menstrual cycle and were analyzed acoustically. In Study 2, results from Study 1 were analyzed jointlywith results fromthree recent studies, which used similar methodologies. Results: Results of Study 1 did not reveal acoustic differences in sustained phonation of vowels across the pill groups and controls. Results of the meta-analysis performed in Study 2 indicated that pill users exhibited lower jitter and shimmer values on sustained vowels, whereas no difference of fundamental frequency was observed among women who use the pill. Conclusions: These results support findings from previous studies, which suggested that no adverse effect on voice was detected among nonprofessional speakers who use new-generation monophasic birth control pills, for the measures studied. Furthermore, results of the meta-analysis suggested that some acoustic properties of the voice, which are reflected in perturbation measures in sustained vowels, may be improved among women who use the pill.

Original languageEnglish
Pages (from-to)1114-1121
Number of pages8
JournalJournal of Speech, Language, and Hearing Research
Issue number5
StatePublished - 1 Oct 2006


  • Acoustic measurements
  • Birth control pills
  • Hormones
  • Voice assessment
  • Women


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