FUNDAMENTAL VOICE FREQUENCY AND JITTER IN GIRLS AND BOYS MEASURED WITH ELECTROGLOTTOGRAPHY - INFLUENCE OF AGE AND HEIGHT

The fundamental frequency and jitter of the voice was measured by elec troglottography in 71 children between the age of 7 and 15 years. In t his series of children the fundamental frequency and jitter did not de pend on the gender. The median (range) fundamental frequency was 244 ( 182-331) Hz in girls and 250 (205-293) Hz in boys. It decreased with i ncreasing height (r = -0.59; P < 0.0005) and age (r = -0.57; P < 0.001 ). The median jitter ratio was 9.7 (1.6-33.3) in girls and 10.3 (2.0-4 .3) in boys. The jitter ratio was negatively related to height (r = -0 .31; P < 0.05), but not to age.