Format list box in Access

I have a listbox in an Access form that populates 3 columns when the form loads.

Does anyone know how to format a yes/no data type in a list box column so it displays "Yes" or "No" instead of "-1" or "0"?

The field gets its value from a checkbox, and the field's format is set in the table properties as Yes/No.

Thanks very much for any ideas.