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Development of reference data for increments in variables related to growth

This paper directs attention to the progress made during the last few decades in methods for the development of reference data for increments and in the application of such data. This progress is exemplified by analyses of increments in recumbent length during infancy based on data from the Fels Longitudinal Study that have led to the development of reference data that can be applied easily to individuals and groups. The methods used to develop incremental reference data have improved considerably, but further progress is needed to construct better models, to refine the procedures for fitting models, and to simplify the application of incremental reference data. © 1992 Wiley‐Liss, Inc.