Table 7. Predictors for impairment at 6 Month: Results of univariate Regression Analysis.

Prognostic factor	B	Lower CI	Upper CI
Age	0.47*	0.28	0.66
Gender	0.45	−4.22	5.13
Subgroup non-specific	3.49	−1.48	8.45
Subgroup disc/root irritation	1.12	−4.68	6.92
Subgroup thoracic spine	−10.19*	−17.76	−2.61
Therapy post surgery	−1.93	−26.59	22.72
Impairment prior to treatment	0.34*	0.25	0.44
Pain prior to treatment	2.85*	1.77	3.93
Duration ≥½ year	12.30*	7.96	16.65
Radiation into lower extremity	7.48*	2.97	11.99
Multifocal complaints	14.16*	8.34	19.98
Physically active	−7.43*	−12.05	−2.82
Smoker	4.99	−0.58	10.55
Intake of analgesics	8.84*	4.35	13.32
Body mass index	0.68*	0.23	1.14
Employed	−9.88*	−15.49	−4.28
Mental resources	−7.12*	−9.57	−4.68
Good self-prognosis on work ability in 2 years	−19.69*	−24.53	−14.84
White collar worker	−9.57*	−14.06	−5.07
Rheumatoid arthritis	19.87*	13.47	26.28
Diabetes	9.21	−1.74	20.17
Tumours	11.91	−1.20	25.02
Mental disorder	18.92*	13.64	24.21
Neurological-sensory disease	9.20*	4.18	14.21
Genitourinary or digestive disease	5.49	−0.03	11.02
Primary therapy active	−3.02	−7.58	1.55
Primary therapy passiv	1.94	−2.58	6.45

B = unstandardized Coefficients B, CI: confidence interval,

^*P<0.05.