Table 6 Multivariate regression analysis of MHQoL-VAS

Self-image (MHQoL1)

I think very positively about myself

Reference

I think positively about myself

− 0.10

[− 0.23, 0.03]

I think negatively about myself

− 0.68*

[− 0.85, − 0.51]

I think very negatively about myself

− 1.28*

[− 1.57, − 0.99]

Independence (MHQoL2)

I am very satisfied with my level of independence

Reference

I am satisfied with my level of independence

− 0.42*

[− 0.53, − 0.32]

I am dissatisfied with my level of independence

− 0.58*

[− 0.72, − 0.43]

I am very dissatisfied with my level of independence

− 0.57*

[− 0.78, − 0.36]

Mood (MHQoL3)

I do not feel anxious, gloomy, or depressed

Reference

I feel a little anxious, gloomy, or depressed

− 0.95*

[− 1.05, − 0.86]

I feel anxious, gloomy, or depressed

− 1.53*

[− 1.68, − 1.38]

I feel very anxious, gloomy, or depressed

− 2.02*

[− 2.25, − 1.78]

Relationships (MHQoL4)

I am very satisfied with my relationships

Reference

I am satisfied with my relationships

− 0.19*

[− 0.29, − 0.09]

I am dissatisfied with my relationships

− 0.48*

[− 0.62, − 0.34]

I am very dissatisfied with my relationships

− 0.53*

[− 0.75, − 0.30]

Daily activities (MHQoL5)

I am very satisfied with my daily activities

Reference

I am satisfied with my daily activities

− 0.24*

[− 0.35, − 0.12]

I am dissatisfied with my daily activities

− 0.44*

[− 0.59, − 0.29]

I am very dissatisfied with my daily activities

− 0.86*

[− 1.09, − 0.62]

Physical health (MHQoL6)

I have no physical health problems

Reference

I have some physical health problems

− 0.19*

[− 0.28, − 0.10]

I have many physical health problems

− 0.49*

[-0.64, − 0.35]

I have a great many physical health problems

− 0.85*

[− 1.08, − 0.63]

Future (MHQoL7)

I am very optimistic about my future

Reference

I am optimistic about my future

− 0.04

[− 0.17, 0.10]

I am gloomy about my future

− 0.67*

[− 0.83, − 0.51]

I am very gloomy about my future ()

− 0.95*

[− 1.17, − 0.72]

Constant

8.70*

[8.57, 8.82]

Adjusted R-squared

0.43