20a. When did you have your (most recent) mammogram?
Month ____ [if 3 years ago or less (21); if more than 3 years ago (24)]
Year 19____ [if 3 years ago or less (21); if more than 3 years ago (24)]
OR
Number ____
1[] Days ago [if 3 years ago or less (21); if more than 3 years ago (24)]
2[] Weeks [if 3 years ago or less (21); if more than 3 years ago (24)]
3[] Months ago [if 3 years ago or less (21); if more than 3 years ago (24)]
4[] Years ago [if 3 years ago or less (21); if more than 3 years ago (24)]
999[] DK (20b)