Omit orphaned postmeta values from wpdb query

Hi.

Please take a look at http://drimproperties.com/property-search-2/

I am using the following code to generate the bedroom select input:

<?php
	$metakey = 'bedrooms';
        $bedrooms = $wpdb->get_col($wpdb->prepare("SELECT DISTINCT meta_value FROM $wpdb->postmeta WHERE meta_key = %s ORDER BY meta_value ASC", $metakey) );

	if ($bedrooms) {
	foreach ($bedrooms as $bedroom) {
	$bedStr = str_replace(".","", $bedroom);
	echo "<option value=\"" . $bedStr . "\">" . $bedroom . "</option>";
		}
	}
?>

Many of these metakey values (namely all of the .5’s) are orphaned from deleted/edited posts. As such I would like to omit them from the query.

Does anyone have insight on how to accomplish this?

Thanks.