The median time to intubation using the Pentax , Truview , GlideScope , and Miller varied with the times being 20.6 ( interquartile range [ IQR ] , 18-27 ) vs 20.1 ( IQR , 18-23 .3 ) vs 30.2 ( IQR , 29.6-35 ) vs 41.3 ( IQR , 33-45 .2 ) seconds , respectively .