While<unk>  classes I and II are associated with relatively easy intubation, classes III and IV are associated with increased difficulty. A systematic review of 42 studies, with 34,513 participants, found that the modified<unk>  is a good predictor of difficult direct laryngoscopy and intubation, but poor at predicting difficult bag mask ventilation. Therefore, the study concluded that while useful in combination with other tests to predict the difficulty of an airway, it is not sufficiently accurate alone.
Mallampati score
Kapandji score
Alvarado score
Tygerberg score
Eagle score
House–Brackmann score
Baux score
Krenning score