Midparental height

<p>For girls, 13 cm is subtracted from the father's height and averaged with the mother's height

For boys, 13 cm is added to the mother's height and averaged with the father's height. 

(The 13 cm represents the average difference in height of men and women.)

For both girls and boys, 8.5 cm on either side of this calculated value (target height) represents the 3rd to 97th percentiles for anticipated adult height.</p>