Background and Aim: In the process of assessing the nasalance scores in patient’s speech, it is vital to know about normative data in the speech of normal subjects. The main objective in this study was to obtain normative data on nasalance scores in normal Persian-speaking children aged 3.5 to 6.5 years.

Methods: In this cross-sectional and comparative study, nasalance was measured in the speech of 112 children (55 boys and 57 girls) in Tehran, Iran. After auditory screening and speech assessments, the subjects who get the sufficient criterions entered the study. Speech sample was obtained by imitation and repeating sentences (14 oral and 3 nasal sentences) and mean nasalance score was measured by Nasal view software.

Results: A mean nasalance score of 46.25% was obtained for nasal sentences and a mean score of 43.67% for fricative sentences, 43.41% for affricative sentences and 42.21% for stop sentences. There was higher nasalance scores in girls but the difference was not significant (p=0.201) there was a significant difference in nasalance scores between different age groups in stop (p=0.037), fricative (p=0.036) and nasal sentences (p=0.032).

Conclusion: Findings of this study prepared good statistical data about nasalance scores in normal Persian-speaking children aged 3.5-6.5 years. The study also revealed that nasalance scores can be different in sentences with same manner of articulation and can be affected by presence or absence of nasal consonants and even age.