Successful intubation on the first attempt occurred in 600 out of 705 patients (85.1%) in the video-laryngoscope group and 504 out of 712 (70.8%) in the direct-laryngoscope group (ARR, 14.3%; 95% CI, 9.9 to 18.7; p<0.001). Among the operators who had performed fewer than 25 intubations, the ARR between the two groups was 26.1% (95% CI, 15.4 to 36.8). Among operators who had performed more than 100 intubations, the ARR was 5.9% (95% CI, −4.1 to 16.0). A total of 1,420 patients (72.9%) were enrolled out of the 1,947 patients that were eligible, and 1,417 were included in final analysis. A total of 705 patients (49.8%) were assigned to the video laryngoscope group and 712 (50.2%) to the direct-laryngoscope group. Median age was 55 years, and 69.7% of the patients were intubated in the ED. The most common indications for intubation was altered mental status (45.3%) and acute respiratory failure (30.4%).

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