Pain Catastrophizing Is Related to Static Postural Control Impairment in Patients with Nonspecific Chronic Low Back Pain: A Cross-Sectional Study

Table 4

Multiple linear regression for clinical measures and pain catastrophizing.

Criterion variable: COP area sway under eyes-closed condition
Model 1
R^2 = 0.251	Adjust R^2 = 0.216		F = 7.147
Predictor variables	Regression coefficient, B	Standardized coefficient, β	p value	VIF
PCS	4.996	0.222	0.045	1.012
lTrA%	287.755	0.341	0.002	1.003
Age	7.095	0.328	0.004	1.009
Excluded variables
SFMPQ	N/A	−0.002	0.987	1.121
VAS	N/A	0.124	0.280	1.105
ODI	N/A	−0.158	0.207	1.325
rTrA	N/A	−0.156	0.231	1.428
Height	N/A	0.132	0.238	1.050
Weight	N/A	0.079	0.479	1.046
Gender	N/A	0.068	0.541	1.035
Model 2
R^2 = 0.258	Adjust R^2 = 0.223		F = 7.400
Predictor variables	Regression coefficient, B	Standardized coefficient, β	p value	VIF
PCS_H	15.168	0.236	0.033	1.009
lTrA%	290.203	0.344	0.002	1.004
Age	7.016	0.325	0.004	1.006
Excluded variables
SFMPQ_S	N/A	0.051	0.658	1.100
SFMPQ_A	N/A	−0.25	0.820	1.048
VAS	N/A	0.126	0.268	1.100
ODI	N/A	−0.138	0.256	1.259
rTrA%	N/A	−0.144	0.267	1.420
Height	N/A	0.139	0.213	1.053
Weight	N/A	0.121	0.289	1.116
Gender	N/A	0.072	0.518	1.036

COP: center of pressure, VAS: Visual Analogue Scale, ODI: Oswestry Disability Index, PCS: Pain Catastrophizing Scale, PCS_H: helplessness subscale of Pain Catastrophizing Scale, SFMPQ: Short-Form McGill Pain Questionnaire, SFMPQ_A: affective subscale in Short-Form McGill Pain Questionnaire, SFMPQ_S: sensory subscale in Short-Form McGill Pain Questionnaire, lTrA%: left transversus abdominis percent thickness change, rTrA%: right transversus abdominis percent thickness change, and N/A: not applicable. Significant p values are marked with.