public function get_slider_results($slider_id)
 {
     self::$results = $this->select_slider_question_results($slider_id);
     if (self::$results !== false) {
         self::$results = $this->set_slider_responses();
     }
     return self::$results;
 }
 public function __construct($slider_id, $ab_test_id)
 {
     if ($ab_test_id === false) {
         return false;
     }
     parent::__construct($slider_id);
     $this->get_ab_test_slider_results($ab_test_id);
 }