Table 3 Logistic regression analysis for each type of social activity among the frail elderly

age

1.03

1.00–1.06

0.086

0.99

0.96–1.01

0.280

1.02

1.00–1.04

0.102

0.99

0.97–1.02

0.586

sex

 men

1

1

1

1

 women

0.96

0.64–1.45

0.859

0.92

0.65–1.30

0.628

1.54

1.18–2.02

0.002

1.95

1.32–2.88

0.001

household composition

 Living with others

1

1

1

1

 Living alone

1.04

0.65–1.68

0.858

0.97

0.64–1.47

0.884

1.04

0.76–1.42

0.799

1.12

0.72–1.72

0.619

economic states

 economic difficulty

1

1

1

1

 no economic difficulty

1.01

0.65–1.56

0.970

2.01

1.34–3.01

0.001

1.58

1.18–2.11

0.002

1.94

1.25–3.01

0.003

mobility

 decline

1

1

1

1

 not decline

2.80

1.35–5.81

0.005

1.26

0.77–2.09

0.360

1.40

0.96–2.03

0.078

1.98

1.09–3.63

0.026

subjective health

 poor

1

1

1

1

 good

1.26

0.83–1.93

0.280

1.13

0.79–1.62

0.494

1.48

1.13–1.95

0.005

1.29

0.87–1.90

0.202

direct contact with relatives living separately

 less than 1 a week

1

1

1

1

 more than 1 a week

0.90

0.53–1.55

0.716

1.09

0.70–1.72

0.693

0.74

0.52–1.05

0.088

0.89

0.54–1.45

0.629

indirect contact with relatives living separately

 less than 1 a week

1

1

1

1

 more than 1 a week

0.94

0.57–1.56

0.812

0.88

0.57–1.35

0.553

0.93

0.67–1.28

0.643

0.81

0.51–1.27

0.355

direct contact with friends and neighbors

 less than 1 a week

1

1

1

1

 more than 1 a week

3.02

1.87–4.86

< 0.001

3.79

2.54–5.67

< 0.001

3.22

2.39–4.36

< 0.001

2.53

1.65–3.90

< 0.001

indirect contact with friends and neighbors

 less than 1 a week

 more than 1 a week

1.30

0.80–2.13

0.293

0.94

0.62–1.43

0.773

1.58

1.16–2.17

0.004

1.65

1.06–2.56

0.026