| Johnson DR et al, 1993, USA | Human adult cadavers. | Controlled trial | Insertion success: | 86% v 73% (p=0.186) | The use of pig skin instead of human skin. |
| SA v PD. | | Insertion times: | 55+/−35 sec v 148+/−96 sec (p<0.01) | Some of the procedures performed on violated cricothyroid membranes because of lack of cadavers |
| | | Ease of method (0 to 10 scale) | 3.0+/−1.5 v 5.1+/−3.3 (p<0.01) | |
| Eisenburger P et al, 2000, Austria | 40 consecutive unembalmed adult human cadavers, who had died 4–24 hours previously | Controlled trial | Insertion success: | 70% v 60% | Limited size of the trial |
| | | Insertion times: | 102+/−42 v 100+/−46 | |
| SA v Seldinger cricothyroidotomies | | Ease of method (1 to 5 scale) | 2.2 v 2.4 | |