Since parent-specific height standards are important in evaluating abnormalities of childhood growth, such standards have been determined from 59,000 height measurements of 11,233 California children aged 1 to 9 years, of white, black, and other racial groups.

Mean heights for the three groups diverged increasingly with age after 1 year: blacks were tallest, the mixed group shortest. Positive correlation between midparent height and child height increased with age. Nonwhite children, especially blacks, were taller for parent height than were whites. The discrepancy may reflect differing growth patterns; or the nonwhite children may become taller than their parents. A convenient "slide rule" is presented, which makes clinically feasible the determination of the parent-specific height centile for any child of either sex in each racial group.

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