Table 3.

Factors affecting the individual domains of quality of life in WHOQoL-BREF questionnaire – logistic regression, forward stepwise method, separate model for each question or domain

Question/ Domain	Factora	OR	95 CI	P value
Q1	Social situation
	- living alone	reference
	- living with a family member	1.649	0.734–3.705	0.226
	- living with a partner	2.509	1.349–4.972	0.004
	Education level
	- primary	reference
	- secondary without graduation	1.177	0.578–2.397	0.653
	- secondary with graduation	2.572	1.206–5.484	0.014
	- tertiary	4.351	1.461–12.957	0.008
	Diastolic blood pressure (per 10 mmHg)	0.672	0.477–0.956	0.023
	Pain (per 1 point in the Visual pain scale)	0.852	0.759–0.956	0.007
Q2	Gender
	- female	reference
	- male	1.784	1.117–2.850	0.015
	Diastolic blood pressure (per 10 mmHg)	0.477	0.341–0.667	< 0.001
	Pain (per 1 point in the Visual pain scale)	0.798	0.724–0.879	< 0.001
DOM 1	Education level
	- primary	reference
	- secondary without graduation	2.472	1.125–5.432	0.024
	- secondary with graduation	2.956	1.364–6.406	0.006
	- tertiary	1.871	0.749–4.675	0.180
	Diastolic blood pressure (per 10 mmHg)	0.961	0.928–0.995	0.027
	Pain (per 1 point in the Visual pain scale)	0.593	0.519–0.678	< 0.001
DOM 2	Gender
	- female	reference
	- male	1.910	1.016–3.591	0.044
	Pain (per 1 point in the Visual pain scale)	0.673	0.585–0.773	< 0.001
DOM 3	Gender
	- female	reference
	- male	0.543	0.297–0.994	0.048
	Pain (per 1 point in the Visual pain scale)	0.785	0.692–0.890	< 0.001
DOM 4	Pain (per 1 point in the Visual pain scale)	0.619	0.511–0.750	< 0.001

^a- only factors significantly influencing the corresponding question or domain with p < 0.05 are mentioned; WHO-QOL BREF – World Health Organization Quality of Life short version; EQ-5D-3 L – the 3-item EuroQol-5D; WHO-QOL: Q1 – overall perception of quality of life; Q2 – the overall perception of their health; DOM1 – physical health domain; DOM2 – psychological domain; DOM3 – social relationships domain; DOM4 – environment domain