Intubation of a critically ill patient is a procedure leading to risks for the patient and nerves for the doctor. However, the association between the size of the Macintosh blade and first attempt success in this study is rightly deemed to be an association. It seems plausible that clogs fitted to size would result in better walking and Macintosh blades chosen to best fit the oropharynx of the patient would result in better intubations.