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. 2014 Jul 30;14(8):13830–13850. doi: 10.3390/s140813830

Figure 9.

Figure 9.

Comparison of instantaneous respiratory rate estimated from tracheal sounds acquired with smartphones and estimated from volume signals (N=9 subjects). (a) Regression line for estimation from Galaxy S4; (b) Bland-Altman plot for estimation from Galaxy S4; (c) Regression line for estimation from iPhone 4s; (d) Bland-Altman plot for estimation from iPhone 4s. In regression plots, the grey dashed line indicates the identity line and the solid black the regression line. In Bland-Altman plots, the solid black line indicates the bias while the dashed green lines indicate the 95% limits of agreement.