<qa>  What is the relationship between influenza vaccination status and Medicare Minimum Data Set?2. To develop estimates, at the nursing home resident level, about the relationship between influenza vaccination status none, SD, HD and Medicare Minimum Data Set MDS coded claims for all-cause hospitalization and overall mortality among the long-stay residents from a single season 2012-2013, for use in a subsequent longitudinal evaluation of national nursing home data and regional publicly reported influenza severity. 