The duration of chronic low back pain is associated with acute postoperative pain intensity in lumbar fusion surgery: a prospective observational study

Table 2 Bivariate analysis of factors correlated with VAS day and VAS night

Independent variables			Dependent variables
	VAS day		VAS night
	Correlation coefficient	P value	Correlation coefficient	P value
Age	0.056	0.309	0.041	0.456
Sex	0.048	0.381	−0.037	0.502
BMI	−0.080	0.145	−0.009	0.874
Operation history	−0.004	0.939	−0.056	0.313
Smoking	−0.0077	0.162	0.035	0.525
Level of preoperative pain (VAS)	0.386	< 0.001*	0.391	< 0.001*
SAS	0.735	< 0.001*	0.766	< 0.001*
SDS	0.734	< 0.001*	0.799	< 0.001*
FRAIL	0.012	0.822	0.05	0.365
Duration of surgery	0.064	0.245	0.102	0.064
Chronic pain duration	0.460	< 0.001*	0.397	< 0.001*
Aetiology of back pain	−0.55	0.319	0.023	0.672

Spearman’s correlation analysis and Pearson’s correlation analysis were used in the bivariate analyses. There was a significant difference between the independent variables and the dependent variables
*P < 0.1 (n = 330)
BMI Body mass index, VAS Visual analogue scale for pain, SAS Self-rating Anxiety Scale, SDS Self-rating Depression Scale, FRAIL FRAIL scale

ISSN: 1471-2253