期刊
SCANDINAVIAN JOURNAL OF WORK ENVIRONMENT & HEALTH
卷 41, 期 5, 页码 478-485出版社
SCANDINAVIAN JOURNAL WORK ENVIRONMENT & HEALTH
DOI: 10.5271/sjweh.3517
关键词
forestry; occupational injury; program evaluation
资金
- WorkSafeBC (Workers' Compensation Board of British Columbia)
- Workers' Compensation Board of Nova Scotia through the FOCUS ON TOMORROW program
- Michael Smith Foundation for Health Research
- Social Sciences and Humanities Research Council
Objectives The aim of this study was to evaluate if safety certification reduces the risk of work injury among experienced manual tree-fallers. Methods This study used a retrospective cohort study design. Experienced manual tree-fallers employed in the Canadian province of British Columbia (N=3251) between 2003-2008 were enumerated from a mandatory faller registry. Registry records with demographic and certification data were linked to workers' compensation claims for injury outcomes. Data were analyzed using discrete time survival analysis over a two-year period, centered on certification date with pre- and post-certification demarcated into four three-month periods. Models were adjusted for demographic, occupation/industry, previous injury, and seasonal/temporal effects. Results The relative risk (RR) of work injury during the post certification periods were elevated in comparison to the pre-certification reference period, but the 95% confidence intervals included 1 for all estimates by the end of follow-up, suggesting no statistically significant increased risk of injury. Results were consistent across different outcome measures of acute injury (ie, fracture or amputations) (N=186), musculoskeletal injury (ie, back strain) (N=137), and serious injury claims (ie, long duration, high cost and/or fatal) (N=155). Conclusion Certification did not reduce the risk of work injury among experienced tree-fallers in the province of British Columbia. Non-statistically significant increases in the observed risk of work injury in the months immediately following certification may be attributable to an intervention effect or a methodological limitation related to a lack of individual-level, time-at-risk exposure data.
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