Number

(%)

TI* à 95%

Sex (n = 48)

Men

45

93.8

02.8 - 98.7

Women

03

06.2

01.3 - 17.2

Profession (n = 48)

Professional of voice**

18

31.2

18.7 - 46.3

Others professions

30

68.8

53.7 - 81.3