Table 3 Collinearity diagnosis

Gender

1.198

1.199

Age

1.027

1.027

Registered residence

1.350

1.350

Marital status

1.387

1.384

Education level

1.367

1.366

Basic endowment insurance

3.493

3.479

Basic medical insurance

2.779

2.775

Nature of working unit before retirement

1.673

1.657

Average monthly income

2.019

2.000

Pension as the main source of living

1.720

1.721

Income surplus

1.353

1.351

Major expenditure items

1.083

1.088

Number of co-residents

2.039

2.027

Living conditions

2.299

2.292

Self rated health

1.344

1.353

Suffering from chronic diseases

1.230

1.284

Self care ability in daily life

1.142

1.132

Demand for family health services

1.053

Demand for preventive health services

1.091