Gender£º  1=male,2=female£»

Age(group):   1=aged 60~69 years, 2=aged 70~79 years, 3=aged ¡İ80 years;

Material status:  1=married, 2=unmarried;

Living arrangement:   1=living alone, 2=living with family;

Residiende:  1=urban, 2=rural;

Education:  1=illiterate, 2=primary, 3=unior high school, 4=senior high school, 5=college and above;

Personal Economic status:  1=Expenditures exceeded income, 2=Balance, 3=Income exceeded expenditures;

Self-rated health:   1=bad, 2=fair, 3=good;

Number of chronic disease:  0=did not suffer from chronic disease, 1=suffered from one chronic disease; 2=suffered from two chronic diseases; 3=suffered from three or more chronic diseases;

Life satisfaction:  1=bad, 2=fair, 3=good;

Mood:  1=bad, 2=fair, 3=good;

Feelings of loneliness:  1=often, 2=sometimes, 3=seldom/never;

Dressing:  1=completely independent, 2=needing some help, 3=completely dependent;

Feeding:  1=completely independent, 2=needing some help, 3=completely dependent;

Transferring:   1=completely independent, 2=needing some help, 3=completely dependent;

Walking:  1=completely independent, 2=needing some help, 3=completely dependent;

Bathing:   1=completely independent, 2=needing some help, 3=completely dependent;

Toileting:  1=completely independent, 2=needing some help, 3=completely dependent;

disability:  1=yes, 0=no.