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Background  One effective way to improve return-to-work (RTW) performance may be to convince the employer that the worker has the necessary skills. The aim of this paper is to investigate the effect of having a professional certification among workers injured in occupational injuries on their return to work.    Methods  The Panel Study of Workers’ Compensation Insurance (PSWCI) targets workers who completed medical care in 2012 after an occupational injury. The study population ( n  = 2000) was stratified by gender, age, region, disability grade, and rehabilitation service use. A total of 1458 workers were finally selected for this study.  The effect of having a certification on RTW status was calculated with an odds ratio and 95% confidence intervals using binomial and multinomial logistic regression analyses. In the binomial logistic regression analysis, the RTW group was made up as a combination of the return to original work and the reemployment groups.    Results  The ORs of RTW among those with a certification compared to those without certification were 1.38 (1.16–1.65) in Model 1, 1.25 (1.05–1.50) in Model 2, and 1.22 (1.01–1.47) in Model 3. Among female workers with a certification, the OR of RTW was 4.60 (2.68–7.91), that of return to original work was 3.21 (1.74–5.91), and that of reemployment was 5.85 (3.34–10.27). Among daily workers with a certification, the OR of RTW was 1.32 (1.03–1.69) and that of reemployment was 1.37 (1.07–1.76).    Conclusion  In conclusion, injured workers with a certification generally had a higher RTW rate. In particular, the RTW rate was higher among female workers and daily workers with a certification than among those without.

Effect of professional certification on employees’ return-to-work rate after occupational injuries in Korea: focusing on vulnerable groups