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

Table 3 Final hierarchical linear regression analysis of the relationship between RMDQ on the psychological instrument scores, health, clinical and sociodemographic variables (n = 147)

	R²	R² Change	β ^a	95% CI for B	St. β	p-value
Variables
Model 1: sociodemographic^b	9.7%	9.7%
Model 2: health/clinical^c	21.9%	12.2%
Model 3: illness perceptions^d	24.4%	2.5%
Brief-IPQ (0–100)			.060	.004 to.117	.195	.035
Model 4: pain catastrophizing^e	25.6%	3.7%
PCS (0–52)			.094	.022 to.167	.224	.011
Model 5: psychological distress^f	22.0%	0.1%
HSCL-25 (1–4)			.307	−1.305 to1.919	.035	.707

^aUnstandardized Beta
^bModel 1: sex, age, ethnicity, education and smoking
^cModel 2: back pain (NRS), 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 (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