Subgroup | Hands-free technique | Event rate | Crude rate ratio | Adjusted* rate ratio (95% CI) |
---|---|---|---|---|
*Adjusted for type of surgery, emergency status, duration of operation, noise, shift, and number of personnel. | ||||
Overall | Used | 2.1% (33/11545) | 0.41 (0.30 to 0.60) | |
Not used | 5.1% (110/2153) | 1.0 (reference) | ||
Blood loss | ||||
<100 ml | Used | 1.4% (15/1051) | 0.95 | 0.99 (0.49 to 1.98) |
Not used | 1.5% (19/1254) | 1.0 | ||
>100 ml | Used | 3.7% (18/486) | 0.34 | 0.41 (0.23 to 0.72) |
Not used | 10.0% (90/880) | 1.0 |