Conditional standards for growth in height of British children from 5·0 to 15·99 years of age

Conditional standards giving centiles for height at time (t + 1) given height at time (t) are illustrated and their use discussed with the aid of examples. Charts have been prepared for both sexes covering the age range of t of 5.0 to 15.99 years. In contrast to velocity standards, these standards utilize all the information inherent in height (t) and height (t + 1). The conditions of their use, however, must be carefully considered. It is stressed that they actually test the normality of height (t + 1) for a given height (t). They make no statement about the normality of height (t).