When using list-type combo boxes (i.e. in your case, you gave it a list of number/text-value pairs), the number part will be column 0 and the text-value will be column 1. If you want to pick up the number value, it would be comboboxname.Column(0) and because of the way you defined it, you treat that value as a number. If you want to pick up the text value, it would be comboboxname.Column(1) and you have to treat it as a string.
Note that you COULD have defined it the other way so that the text comes first and the number comes second. It IS arbitrary in how you define the list. But just remember that you have to be consistent whichever way you do it.
For some reason, a LOT of indexed items in Access are addressed this way, starting from 0 rather than from 1. Therefore, if you are going to use the xxxx(nnn) syntax, be sure to look up whether the item in question uses zero-based or one-based numbering. MOST of the time, it will be zero-based.