Table S5.

Results obtained through multiple imputations for the two-part models for the probability of utilizing resources and the monetary value of the utilized resource at the (A) 6, (B) 12 and (C) 24 month follow-up

A)
First part – logistic regression model
Parameter		Beta-estimate		95% CI				P-values
Age, per year increment		0.0064		−0.0359		0.0488		0.7654
Female sex		0.7232		−0.1046		1.5511		0.0868
Pain catastrophizinga		0.0413		0.0047		0.0779		0.0269
Moderate to severe pain		0.0752		−0.8338		0.9841		0.8712
Second part – generalized linear models with a gamma family and log link
Parameter		Beta-estimate		95% CI				P-values
Age, per year increment		−0.0549		−0.1512		0.0414		0.2628
Female sex Pain catastrophizinga		0.3992 0.0673		−0.8728 0.0112		1.6713 0.1235		0.5379 0.0188
Moderate to severe pain		1.1650		−0.4457		2.7756		0.1558
B)
First part – logistic regression model
Parameter	Beta-estimate				95% CI			P-values
Age, per year increment	0.0033				−0.0454		0.0521	0.8934
Female sex	−0.2763				−1.3502		0.7978	0.6139
Pain catastrophizinga	0.0020				−0.0415		0.0455	0.9267
Moderate to severe pain	1.2426				0.2091		2.2760	0.0185
Resource utilization at 6 months  No  Yes  No pain at 6 monthsb	Reference group							0.0616
	1.0504				0.1034		1.9974
–0.1702		−0.9665			0.6261
Second part – Generalized linear models with a gamma family and log link
Parameter	Beta-estimate				95% CI			P-values
Age, per year increment	−0.0685				−0.1384		0.0015	0.0551
Female sex	−0.6664				−2.3671		1.0343	0.4419
Pain catastrophizinga	0.0107				−0.0634		0.0849	0.7768
Moderate to severe pain	1.7631				0.1438		3.3825	0.0329
Resource utilization at 6 months  No  Yes  No pain at 6 monthsb	Reference group							0.8336
	0.2900				−1.8598		2.4398
	0.6984				−1.8040		3.2008
C)
First part – logistic regression model
Parameter	Beta-estimate				95% CI			P-values
Age, per year increment	0.0094				−0.0470		0.0658	0.7441
Female sex	0.3689				−0.7435		1.4813	0.5157
Pain catastrophizinga	0.0246				−0.0189		0.0681	0.2668
Moderate to severe pain	1.3888				0.2532		2.5244	0.0165
Resource utilization at 12 months  No  Yes  No pain at 12 monthsb	Reference group							0.1146
	0.8922				0.0174		1.7669
	−0.1149				−0.8646		0.6348
Second part – generalized linear models with a gamma family and log link
Parameter	Beta-estimate				95% CI			P-values
Age, per year increment	−0.0249				−0.5948		0.5450	0.9318
Female sex	0.2791				−6.4593		7.0175	0.9353
Pain catastrophizinga	−0.0232				−0.5089		0.4626	0.9225
Moderate to severe pain	0.5026				−11.4459		12.4510	0.9343
Resource utilization at 12 months  No  Yes  No pain at 12 monthsb	Reference group							0.8704
	−0.6875				−12.0416		10.6666
	−2.2881				−10.7756		6.1994

Notes:

^aPer point increment on the pain catastrophizing scale;

^breflects individuals who did not report any pain at 12 months in whom no resource could therefore be utilized.