The impact of psychological factors on condition-specific, generic and individualized patient reported outcomes in low back pain

Table 4 Final hierarchical linear regression analysis of the relationship between EQ-5D and the psychological scales adjusted for sociodemographic and health/clinical variables (n = 150)

	R²	R² change	β ^a	95% CI for B	St. β	p-value
Variables
Model 1: sociodemographic^b	7.5%	7.5%
Model 2: health/clinical^c	14.7%	7.2%
Model 3: illness perceptions^d	22.6%	7.9%
Brief-IPQ (0–100)			-.007	-.011 to -.003	-.345	.000
Model 4: pain catastrophizing^e	17.2%	2.5%
PCS (0–52)			-.005	-.010 to.000	-.184	.045
Model 5: psychological distress^f	15.3%	0.6%
HSCL-25 (1–4)			-.056	-.166 to.054	-.098	.316

^a Unstandardized Beta
^bModel 1: sex, age, ethnicity, education and employment
^cModel 2: back pain (NRS 1–10), baseline RMDQ, baseline EQ-5D, clinical setting (GP or PT) and type of treatment (usual care or cognitive intervention) in addition to the sociodemographic variables in model 1
^dModel 3: illness perceptions by the Brief IPQ (sum score) in addition to the variables in model 1 and 2
^eModel 4: pain catastrophizing by the PCS (sum score) in addition to the variables in model 1 and 2
^fModel 5:) psychological distress by the HSCL-25 (sum score) in addition to the variables in model 1 and 2

ISSN: 1477-7525