CTS claimants recover to about half of their pre-injury earnings level relative to that of comparison groups after 6 years; they also endured periods on time-loss three times longer than claimants with upper extremity fractures. CTS surgery claimants had better outcomes than those who did not have surgery. Earnings recovery fractions among CTS claimants were better for workers who: (1) were younger; (2) had stable pre-claim employment; (3) lived in the Puget sound area; (4) worked for large businesses; (5) worked in non-construction/transportation industries; or (6) were in the higher pre-injury earnings categories. Cumulative excess loss of earnings of the 4,443 CTS claimants was 197 million dollars to 382 million dollars over 6 years, a loss of 45,000-89,000 dollars per claimant. This underscores the importance of prevention, early diagnosis, and accommodation for return to work.

Individual and industry/occupation factors are related to underreporting of work-related injury or illness to the WC system.

Policies are needed to improve screening and training of temporary workers to assigned tasks, to discourage job-switching, to improve temporary workers' hazard awareness, to protect their right to report unsafe conditions. The responsibilities of agencies and host employers for ensuring the safety of their temporary workers need clarification in regulatory policy.

There is strong evidence that several OHS policy levers are effective in terms of reducing injuries and/or increasing compliance with legislation. This study adds to the evidence on OHS regulatory effectiveness from an earlier review. In addition to new evidence supporting previous study findings, it included new categories of evidence-compliance as an outcome, nature of enforcement, awareness campaigns, and smoke-free workplace legislation. Am. J. Ind. Med. 59:919-933, 2016. © 2016 Wiley Periodicals, Inc.