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

Table 5 Final hierarchical linear regression analysis of the relationship between PGI and the psychological scales adjusted for sociodemographic and health/clinical variables (n = 137)

	R²	R² Change	β^a	95% CI for B	St. β	p-value
Variables
Model 1: sociodemographic^b	0.5%	0.5%
Model 2: health/clinical^c	4.6%	4.1%
Model 3: illness perceptions^d	8.1%	3.6%
Brief-IPQ (0–100)			-.426	-.819 to -.032	-.230	.034
Model 4: pain catastrophizing^e	5.9%	1.3%
PCS (0–52)			-.325	-.829 to .180	-.129	.205
Model 5: psychological distress^f	5.6%	1.1%
HSCL-25 (1–4)			−6.306	−17.126 to 4.514	-.119	.138

^aUnstandardized Beta
^bModel 1: sex, age
^cModel 2: back pain, baseline PGI, baseline EQ-5D, clinical setting (GP or PT) and type of treatment (usual care or cognitive intervention) in addition to the sociodemographic variables (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