From: Standard operating procedure changed pre-hospital critical care anaesthesiologists’ behaviour: a quality control study
Ventilator used
Before SOP (CI)
After SOP (CI)
Total
Yes
42
64
106
No
67
29
96
109
93
202
Prevalence
0.39 (0.29-0.48)
0.69 (0.58-0.78)
0.52