Association of between long working hour injuries occurring nine or more hours into a shift and adverse health outcomes
| Outcome variable | OR (95% CI) | P-value |
| Incident resulted in fatal injury to worker | ||
| Crude model | 1.48 (1.32 to 1.65) | <0.001 |
| Adjusted model* | 1.32 (1.18 to 1.48) | <0.001 |
| Incidents resulting in injuries to two or more workers | ||
| Crude model | 1.81 (1.66 to 1.98) | <0.001 |
| Adjusted model† | 1.73 (1.58 to 1.89) | <0.001 |
Logistic regression models based on all reported injuries to MSHA Part 50 Program in USA: 1983–2015.
*Adjusted for year of accident, sex, age, total years of experience in current mine <2 years, apprentice/trainee, employed by a contractor, canvass or class of commodity mined and number of employees at mine.
†Adjusted for year of accident, sex, total years of experience in current mine <2 years, employed by a contractor, canvass or class of commodity mined, not working at their primary occupation/job/role at time of injury, injury occurred offsite and number of employees at mine.
MSHA, Mine Safety and Health Administratio n