Examining the changes in the spine curve during growth is of great importance in early identification and prevention of the development of structural disorders of the spine. However, most of the studies published in this regard have focused on the use of X-rays as the gold standard for spine evaluation. Therefore, considering the ethical aspects of the widespread use of harmful X-rays, few studies can be found that have investigated the normal values of the kyphosis angle, especially in children without a background of disease and spine disorders, by conducting an evaluation in a large population.