Better way to loop through table columns?

I'm using two .each() loops through table columns -- first column loop then second column loop -- to set column styles based on column values, as follows:

<script type="text/javascript">
$(document).ready(function(){
    $('tbody tr td:nth-child(1)').each(function() {
        if ($(this).text()>'480') {
            $(this).addClass('red');
            }
    });
    $('tbody tr td:nth-child(2)').each(function() {
        if ($(this).text()=='Boy') {
            $(this).addClass('blu');
            }
    });
});
</script>

Select allOpen in new window

Although this works successfully, it seems to be inefficient as it loops the same table rows twice.

What I would like to do is to loop the rows once only, and then in each .each() iteration I would like to test both column1 and then column2 to set their Class, but I cannot work out how to do that (something like):

<script type="text/javascript">
$(document).ready(function(){
    $('tbody tr').each(function() {
        // test first td column
 
        // test second td column
     
    });
});
</script>

Select allOpen in new window

Can anyone point me in the right direction?