Table III. Mixed effects logistic regression model results.
| Unadjusted RR Injury | p-Value | Adjusted RR Injury | p-value | |
|---|---|---|---|---|
| Hours of work previous 7 days | ||||
| <48 hrs | Referent | --- | Referent | --- |
| 48-59 hrs | 0.93 (0.79-1.10) | 0.61 | 0.92 (0.78-1.09) | 0.36 |
| ≥60 hrs | 1.04 (0.84-1.28) | 1.12 (0.89-1.41) | 0.33 | |
|
| ||||
| Crewmember Familiarity | ||||
| 0-1 shifts | Referent | --- | Referent | --- |
| 2-7 shifts | 1.04 (0.88-1.23) | 0.63 | 1.05 (0.89-1.25) | 0.54 |
| 8-19 shifts | 1.11 (0.93-1.33) | 1.13 (0.94-1.36) | 0.19 | |
| ≥20 shifts | 1.12 (0.91-1.38) | 1.18 (0.95-1.47) | 0.15 | |
|
| ||||
| Short Recovery (<11 hrs) | 0.93 (0.76-1.13) | 0.46 | 0.95 (0.77-1.17) | 0.60 |
|
| ||||
| Number of shifts in a month | 0.99 (0.97-1.00) | 0.08 | 0.96 (0.94-0.98) | <0.0001 |
|
| ||||
| Proportion of night hours | 0.80 (0.63-1.00) | 0.05 | 0.78 (0.61-0.98) | 0.03 |
|
| ||||
| Employment status | ||||
| Full-time | Referent | --- | Referent | --- |
| Part-time | 0.90 (0.77-1.04) | 0.15 | 0.70 (0.58-0.86) | 0.001 |
|
| ||||
| Midpoint Agency Size(20 person units) | 0.99 (0.88-1.11) | 0.84 | 0.99 (0.87-1.12) | 0.84 |