Table 4.

General linear regression models of factors potentially associated with back pain intensity

Independent variables	VASBACK change	p value
	Regression coefficient
Age	0.014	0.38
Male sex	0.59	0.17
Presence of rs4633 allele T	−1.45	0.0032
Independent variables	VASBACK change	p value
	Regression coefficient
Age	0.012	0.44
Male sex	0.53	0.22
Presence of rs4680 allele A	−1.2	0.046
Independent variables	VASBACK change	p value
	Regression coefficient
Age	0.01	0.47
Male sex	0.66	0.13
Presence of COMT haplotype L	−1.3	0.014
Independent variables	ODI change	p value
	Regression coefficient
Age	0.009	0.89
Male sex	2.36	0.18
Presence of COMT haplotype L	−4.14	0.051

Significance for bold numbers in all the text (including tables) is p < 0.05