How to get drop-down list to display text and #s but insert only #
 

I am creating a survey and each cell has a drop-down list that displays the
Likert scale from 1-5. I would like the drop down list to display the Likert
description in the drop-down, for example: 1-Strongly Disagree, 2-Disagree,
3-Neutral, and so on up to 5. But when the user selects one of the options, I
would like only the number to be inserted into the field because we are
averaging the scores.