0=poor 1=moderate 2=good
0=none 1=mild 2=moderate 3=severe
date of death of spouse, coded 1/1/2000 if spouse still alive
group 1 contains the 226 index-cases (113 couples) who were both age 75 years and over and therefore both in the initial study and also living as a two-person household at interview; group 2 contains 118 index cases who had spouses below 75 years at interview but were again in a two-person household; and group 3 contains 55 index-cases who were living with a spouse and another person at the time of interview
1=male 2=female