Table 2.

Hazard of opioid-related morbidity: Cox PH regression results stratified by age groups and region

	Model 1*		Model 2†
	HR	95% CI	HR	95% CI
Non-injured (ref.)
Injured	1.79	1.24 to 2.60
Medical-only injured			1.54	1.02 to 2.32
Lost-time injured			2.91	1.75 to 4.84
Male	1.14	0.65 to 2.01	1.14	0.65 to 2.01
Health insurance type
Preferred provider organisation plan (ref.)
Consumer directed health plans	0.94	0.49 to 1.82	0.94	0.49 to 1.82
Comprehensive	0.49	0.13 to 1.83	0.49	0.13 to 1.84
High-deductible health and exclusive provider organisation plan	0.04	0.01 to 0.15	0.04	0.01 to 0.15
Health maintenance organisation	2.47	0.91 to 6.71	2.47	0.91 to 6.72
Point-of-service plan	2.54	1.14 to 5.67	2.54	1.14 to 5.66
Industry
Services (ref.)
Manufacturing – durable goods	2.65	1.08 to 6.49	2.64	1.08 to 6.47
Manufacturing – non-durable goods	1.76	0.61 to 5.11	1.75	0.60 to 5.09
Transportation, communications and utilities	1.40	0.60 to 3.24	1.38	0.59 to 3.21
Other‡
Number of obs.	57 525
Wald χ2 (14)	114.34
Prob>χ2	0.0001

^*All injured workers together.

^†Injured workers were divided into two: medical-only and lost-time injured workers.

^‡Coefficients could not be estimated due to small number of observations for this category.

PH, proportional hazard.