Table 3.

Odds ratios of return-to-work rate by certification

	Return-to-work*
	Model 1				Model 2				Model 3
	OR	95% CI			OR	95% CI			OR	95% CI
Certification
Yes	1.38	1.16	−	1.65	1.25	1.05	−	1.50	1.22	1.01	−	1.47
No	1.00				1.00				1.00

*Returned to original work group and reemployed group were integrated into RTW group

Model 1: Adjusted for age and sex

Model 2: Adjusted for Model 1 + marital status, education level, industry, status of workers, number of employees, and duration of employment

Model 3: Adjusted for Model 2 + disability rating and occupational injury type