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What are the sex differences between chronologic age and 
                              maturational age?      


                    Chronologic age does not take into account differences between
                    growing individuals relative to physical development.  Children of
                    the same chronologic age can vary considerably in their stage of
                    maturational development.  In general, girls chronologically develop
                    earlier than boys, but the exception to this is certainly commonly
                    seen.  At the same stage of growth,  a girl who is delayed
                    in development is often chronologically older than a boy who is
                    advanced in development.  It is for this very basic physiologic
                    reason whereby every  child demonstrates their own unique
                    pattern of development, that chronologic age should be avoided
                    for the purposes of evaluating the timing of growth and for the  
                    rational timing of treatment.

                   Maturational age, as discussed in this context, can be considered
                    the common denominator between individuals regardless of gender
                    or chronologic age.  Females and males who share the same
                    maturational age ( stage + level ) also demonstrate the same
                    percentages of total growth completed.  Because of this fact,
                    maturational age provides the clinician with a clearer diagnostic
                    basis for treatment planning since the variability associated with
                    chronologic age have been eliminated.

                   The following chart demonstrates a comparison of both female and
                    male percentages of total growth completed at selected stages
                    and one level of maturation.


       MAX.          MAND.         SMI            MAX.          MAND.

       93.3              91.0               3                   93.3              90.1

        95.1              93.3               6                   95.5              93.5

        98.5              98.3               9                   98.4              98.2

        This sample data represents selected stages ( SMIs ) at an average
          level of maturation.  Similar conformity of data representing both
          sexes exists relative to all combinations of the 23 maturational stages
          and the 14 maturational levels employed by the System of Skeletal
          Maturation Assessment.

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