Table 4 Variance inflation factor values for study variables

Social interaction with

 Colleague

2.33

 Female friend

1.34

 Male friend

1.38

Social support

1.10

General trust

1.13

Membership in organisation

1.10

Age group (15–29 = REF)

 30–45

3.88

 46–64

4.31

 65+

4.62

Income (≤100,000 = REF)

 100,000–199,999

2.80

 200,000–299,999

3.25

 300,000–399,999

3.67

  ≥ 400,000

4.13

Education (Low = REF)

 Middle

1.87

 High

2.20

Employment (Employed = REF)

 Student

2.32

 Unemployed

1.15

 Pensioner

4.05

 Other

1.15

Civil status (Married/lived with partner = REF)

 Widowed/divorced/separated

1.10

 Single

1.57

Lived with under 18 children

1.70

Mean VIF

2.37