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Clarke error grid to quantify clinical accuracy of the respiratory rate measurements by radar. Region (E) represent those points where tachypnoea and bradypnoea are confused, region (D) indicates a potentially dangerous failure to detect bradypnoea or tachypnoea, in region (C) are points leading to unnecessary treatment, region (B) contains points outside 20 % of the reference but not leading to unnecessary treatment, region (A) are points within 20 % of the reference measurement
