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A Bland-Altman plot comparing concurrent arterial carbon dioxide tension (PaCO2) and end-tidal carbon dioxide tension (PETCO2) measurements (bias = 0.66, standard deviation = 1.22, limits of agreement = −1.72, 3.05, bias confidence interval [CI] 95% CI = 0.57-0.76, lower limit of agreement CI 95% CI = −1.89 to −1.56, upper limit of agreementCI 95% CI = 2.88–3.21)
