Fig. 2From: The skill of tracheal intubation with rigid scopes – a randomised controlled trial comparing learning curves in 740 intubationsPredicted first attempt success probability with 95% confidence intervals (dark grey) and 95% prediction intervals (light grey). In order to reach a 90% first attempt success probability, 14 and 20 trials are needed with Bonfils and SensaScope, respectivelyBack to article page