umber the maximum age. It is also possible to use differing ranges by sex when <code>split.by.sex = TRUE</code>: use a named list  of length two with names referring to <code>female.sex</code> and <code>male.sex</code>. Provide a numeric vector of length 2 to each element (first number defining the minimum age to include and the last number the maximum age). See Examples.</p></dd>


<dt>female.sex, male.sex</dt>
<dd><p>A character or integer denoting female and male sex in the <code>sex</code> column of <co