- a Chi-square tests (two-tailed). In 2011, p value was calculated by coding “Death” as frail
- b Quit smoking, not applicable/no smoking was coded as “Yes” in 2007 and 2011
- c Drinking less, not applicable/no drinking was coded as “Yes” in 2007 and 2011
- d Educational level: Lower: illiterate + elementary school, higher: from junior high school to senior high education and above
- e Muscular skeletal disease includes joint arthritis, hip fractures, and osteoporosis