Table 5.

Negative binomial generalized linear model examining associations between number of comorbid chronic pain conditions and sociodemographic and biopsychosocial characteristics at baseline (n=3,906)

	Wald χ2	P-value	β	SE	95% CI
					Lower bound	Upper bound
Intercept	878.27	<0.001	−1.19	0.05	−1.29	−1.09
Sex – female	57.84	<0.001	0.48	0.06	0.36	0.61
Sex – male
Age	7.03	0.008	0.01	0.002	0.002	0.01
Pain duration	25.24	<0.001	0.02	0.003	0.01	0.02
Average NRS pain intensity	0.22	0.640	0.01	0.02	−0.03	0.04
PCS	0.001	0.989	0.001	0.003	−0.01	0.01
BDI-I	2	0.158	0.01	0.004	−0.002	0.01
SF12 version 2, physical	9.39	0.002	−0.01	0.004	−0.02	−0.004

Abbreviations: NRS, Numeric Rating Scale; PCS, Pain Catastrophizing Scale; BDI Beck Depression Inventory; SF, Short Form.