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Comparison of views obtained during laryngoscopy.
| Cormack and Lehane | Sniffing position | Simple extension | P value |
|---|---|---|---|
| (n = 275) | (n = 271) | ||
| Grade 1 | 171 (62.2) | 145 (53.5) | 0.144 |
| Grade 2 | 82 (29.8) | 101 (37.3) | |
| Grade 3 | 21 (7.6) | 25 (9.2) | |
| Grade 4 | 1 (0.4) | 0 (0) |
Values are numbers (percent).
