Impact of gastroesophageal reflux disease on the quality of life of Polish patients

Table 2 Effect of selected variables on health-related quality of life measured using SF-36

Variable explained (percent of variability explained1)	Explanatory variables2	Beta	Sig.
PF (41%)	Stress	-0.37	0.000002
	Age	-0.31	0.000097
	BMI	-0.24	0.0022
	GERD Symptoms	-0.15	0.045
RP (36%)	Stress	-0.47	< 0.000001
	BMI	-0.26	0.0006
	GERD Symptoms	-0.18	0.022
BP (29%)	Stress	-0.41	0.000002
	GERD Symptoms	-0.25	0.002
	Sex (1 = M, 2 = F)	-0.17	0.028
GH (37%)	Stress	-0.43	< 0.000001
	Age	-0.31	0.00005
	GERD Symptoms	-0.17	0.028
Vt (45%)	Stress	-0.67	< 0.000001
SF (32%)	Stress	-0.49	< 0.000001
	GERD Symptoms	-0.21	0.010
RE (44%)	Stress	-0.56	< 0.000001
	GERD Symptoms	-0.21	0.004
	BMI	-0.20	0.005
MH (59%)	Stress	-0.77	< 0.000001
PCS (30%)	Stress	-0.29	0.00041
	Age	-0.35	0.000017
	GERD Symptoms	-0.22	0.0061
MCS (53%)	Stress	-0.68	< 0.000001
	GERD Symptoms	-0.13	0.047

¹Adjusted R square × 100;

²Variables: Stress, age, PF and BP were transformed to minimize their skewness. PF: Physical functioning; RP: Physical problems; BP: Bodily pain; GH: General health perceptions; Vt: Vitality; BMI: Body mass index; GERD: Gastro-esophageal reflux disease; SF: Social functioning; RE: Role limitations due to emotional problems; MH: Mental health perceptions; PCS: Physical Component Summary; MCS: Mental Component Summary.