public function col_feedbacktext($attempt) {
        if ($attempt->state != quiz_attempt::FINISHED) {
            return '-';
        }

        $feedback = quiz_report_feedback_for_grade(
                quiz_rescale_grade($attempt->sumgrades, $this->quiz, false),
                $this->quiz->id, $this->context);

        if ($this->is_downloading()) {
            $feedback = strip_tags($feedback);
        }

        return $feedback;
    }