$selectField = "MAX(ROUND($weightField)) AS max_weight";
$weightDAO = CRM_Utils_Weight::query('SELECT', $daoName, $fieldValues, $selectField);
$weightDAO->fetch();
$selectField = "MAX(ROUND($weightField)) AS max_weight";
$weightDAO = CRM_Utils_Weight::query('SELECT', $daoName, $fieldValues, $selectField);
$weightDAO->fetch();