Fig. 1. A , Cumulative sum (cusum) chart for bag-and-mask ventilation. Lines A − O represent the learning curves of individual interns. Lines h1 and h0 represent upper and lower control limits of 2.24 and −2.24. Y-axis values represent multiples of h1 and h0. B , Risk-adjusted cusum chart for bag-and-mask ventilation. C , Cusum chart for orotracheal intubation. Lines A − O represent the learning curves of individual interns. Lines h1 and h0 represent upper and lower control limits 2.24 and −2.24. Y-axis values represent multiples of h1 and h0. D , Risk-adjusted cusum chart for orotracheal intubation.

Fig. 1. A , Cumulative sum (cusum) chart for bag-and-mask ventilation. Lines A − O represent the learning curves of individual interns. Lines h1 and h0 represent upper and lower control limits of 2.24 and −2.24. Y-axis values represent multiples of h1 and h0. B , Risk-adjusted cusum chart for bag-and-mask ventilation. C , Cusum chart for orotracheal intubation. Lines A − O represent the learning curves of individual interns. Lines h1 and h0 represent upper and lower control limits 2.24 and −2.24. Y-axis values represent multiples of h1 and h0. D , Risk-adjusted cusum chart for orotracheal intubation.

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