Table 5.

Logistic regression model for patients’ perception of improvement in back pain, leg pain, function and general health at 2 weeks postsurgery

Model	Predictor	Β	Odd ratio (95% CI)	S.E	p
Back pain improvement	Back VAS	1.68	5.36 (1.45 to 19.83)	.67	.012
	Leg VAS	−1.70	.18 (.05 to .76)	.73	.019
	BDI	.28	.76 (.59 to .97)	.13	.026
	Constant	3.62	37.34	2.44	.139
Leg pain improvement	Smoker*	−1.61	.20 (.05 to 2.77)	1.34	.230
	Symptom’s duration	−.07	.93 (.86 to 1.01)	.04	.091
	Back pain	−1.15	.32 (.08 to 1.30)	.72	.111
	Leg pain	.13	1.14 (.75 to 1.74)	.22	.547
	Constant	12.20	3.85	1.97	.080
Function improvement	Back pain	−.25	.79 (.55 to 1.13)	.18	.789
	Leg pain	−.09	.93 (.66 to 1.29)	.17	.925
	Smoker*	−1.68	.19 (.04 to .97)	.56	.046
	Constant	4.04	56.35	1.58	.347
General health improvement	BMI	.20	1.22 (1.00 to 1.49)	.10	.041
	Worker’s compensation†	−5.81	.01 (.00 to .87)	2.89	.045
	Smoking*	−5.71	.01 (.00 to 1.14)	2.98	.035
	Somatic perception	.62	1.85 (.89 to 3.85)	.37	.099
	Constant	−5.63	.01	3.35	.093

^*Reference = smoker,

^†Reference = yes, p<0.05