Block diagram of the stable band-pass system.

<p>Block diagram of the stable band-pass system.</p

Examples of different strategies to perform the double integration.

<p>Direct integration (A), suppression the DC component of the acceleration (B), reset of the initial condition for the velocity after each compression (C), and reset of the initial condition both for the velocity and for the displacement (D).</p

Bland-Altman plot of the errors in rate for the three methods.

<p>Bland-Altman plot of the errors in rate for the three methods.</p

Median values and i-percentiles, Pi, of the unsigned error obtained in the estimation of the compression depth for each method.

<p>Values are expressed in mm. LF: linear filtering; ZCV: zero-crossing velocity; SA: spectral analysis.</p

Graphical example of the LF method, based on band-pass filtering.

<p>Graphical example of the LF method, based on band-pass filtering.</p

Median values and i-percentiles, Pi, of the unsigned error obtained in the estimation of the compression rate for each method.

<p>Values are expressed in cpm.</p

Histograms of the global errors in rate for the three methods.

<p>Histograms of the global errors in rate for the three methods.</p

Boxplots of the errors in depth for the three methods by target rate.

<p>Boxplots of the errors in depth for the three methods by target rate.</p

Boxplots of the global errors in depth for the three methods.

<p>Boxplots of the global errors in depth for the three methods.</p

Boxplots of the errors in depth for the three methods by rescuer couple.

<p>Boxplots of the errors in depth for the three methods by rescuer couple.</p