System attributes set to not display on product page are displaying on product page?

Question

I wrote a simple code for a custom tab to display all atrributes that had a value. But it's returning system attributes that clearly should not be displayed. In the attributes management page in Admin, I checked and triple checked to make sure these attributes were set to NOT display. I refreshed all indexes and flushed all cache, but still showing. Any ideas why this is happening?

Code below, for reference.

$_product = $this->getProduct(); 
$attributes = Mage::getResourceModel('catalog/product_attribute_collection')
    ->getItems();
foreach ($attributes as $attribute){

    $productAttributeCode=$attribute->getAttributeCode();
    $productAttributeData=$_product->getData($productAttributeCode);

    if ($productAttributeData > ""){
        if ($productAttributeCode != "status"){ 
            echo '<div class="std">';
            echo $attribute->getFrontendLabel();
            echo ': ';
            //echo $productAttributeCode;
            //echo ': ';
            echo $productAttributeData;
            echo '</div>';
            }
        }
    }

Answer 1

You should check if attribute is visible on frontend:

if ($attribute->getIsVisibleOnFrontend()) {
    (...)
}