Reference equations for predicting standing height of children by using arm span or forearm length as an index.

Background: Standing height (SH) is the most reliable parameter used to predict spirometric values in children, but measurement of this parameter may be difficult in children with thoracic or spinal abnormalities. This study was designed to establish reference equations to estimate SHs of children using their arm span length (ASL) or forearm ulnar length (UL) as an index.

Methods: Children aged 1-17 years were enrolled to measure their SH, body weight, ASL, and UL.