Table 1 Definition of variables.

From: Prevalence and related influencing factors of depression symptoms among empty-nest elderly in China

Variables

Variables description

Gender

Male = 0, Female = 1

Age

60–69 years old = 1, 70–79 years old = 2, 80 years old and above = 3

Education level

Illiterate = 1, Junior high school or below = 2,

High school or above = 3

Marital status

Without spouse = 0, With spouse = 1

Place of residence

Rural = 0, Urban = 1

Self-rated health status

Unhealthy = 1, Fair = 2, Healthy = 3

Frequency of contact with children

Low = 1, Moderate = 2, High = 3

Satisfaction with children

Dissatisfied = 1, Fair = 2, Satisfied = 3

Satisfaction with life

Dissatisfied = 1, Fair = 2, Satisfied = 3

Social activities

No = 0, Yes = 1

ADL

Independent = 0, Dependent = 1

Chronic diseases

No = 0, Yes = 1

Physical pain

No = 0, Yes = 1

Sleep duration

7 h or more = 0, Less than 7 h = 1

Drinking

Drinks infrequently = 0, Drinks frequently = 1

Smoking

Never = 1, Current = 2, Former = 3

Exercise

No = 0, Yes = 1

Household economic status

Non-impoverished household = 0,

Impoverished household = 1

Medical insurance

No = 0, Yes = 1

Pension

No = 0, Yes = 1