Table 4.

R² of the models used to draw growth curves for boys and girls separately and for both genders combined

Gender, hand dominance	Model variable*	R2†
Boys, dominant	Age	79%
Boys, dominant	Age, height, weight	80%
Girls, dominant	Age	80%
Girls, dominant	Age, height, weight	83%
Boys, nondominant	Age	77%
Boys, nondominant	Age, height, weight	79%
Girls, nondominant	Age	80%
Girls, nondominant	Age, height, weight	84%
All combined (both hands, both genders)	Age	76%
All combined (both hands, both genders)	Age, height, weight	80%

* The simpler model accounts for age only whereas the more complex model accounts for height and weight along with age; ^†R² indicates the explained variance of the simple model, including age, and the more complex model, including age, height, and weight.