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Communications to the Editor |

Bias and Precision in Noninvasive Monitoring Bias and Precision in Noninvasive Monitoring FREE TO VIEW

Peter Baylor, MD
Author and Funding Information

Affiliations: VA Central California Health Care Systems, Fresno, CA ,  Los Angeles County, University of Southern California Medical Center, Los Angeles, CA

Peter Baylor, MD, VA Central California Health Care Systems, 2615 East Clinton Ave, Fresno, CA 93703; e-mail: baylor@USVA.gov



Chest. 1999;116(4):1140. doi:10.1378/chest.116.4.1140
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To the Editor:

The recent article in CHEST by Shoemaker et al (December 1998)1 concerning the agreement between thermodilution and bioimpedance cardiac outputs has some discrepancies. In the narrative, it is stated that the bias and precision are− 0.124 ± 0.75 L/min/m2, yet in Figure 2 it is stated that the bias and precision are −0.124 ± 0.85 L/min/m2. If the bias and limits of agreement are− 0.124 and −1.56 to +1.32, respectively, as stated, then the precision cannot be either 0.75 or 0.85 L; it has to be 0.72 L. Also in Figure 2, it can be seen clearly that the positive limit of agreement is farther from the bias of −0.124 than is the negative limit of agreement. The limits of agreement should be equidistant from the bias.

Shoemaker, WC, Belzberg, H, Milzman, DP, et al (1998) Multicenter study of noninvasive monitoring systems as alternatives to invasive monitoring of acutely ill emergency patients.Chest114,1643-1651. [PubMed] [CrossRef]
 

Bias and Precision in Noninvasive Monitoring

To the Editor:

Thanks to Dr. Baylor for pointing out a discrepancy between the bias and precision values in the text and Figure 2 in our recent article (December 1998).1 The text is correct, and the legend of Figure 2 is in error.

References
Shoemaker, WC, Belzberg, H, Milzman, DP, et al Multicenter study of noninvasive monitoring systems as alternatives to invasive monitoring of acutely ill emergency patients.Chest1998;114,1643-52. [PubMed] [CrossRef]
 

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References

Shoemaker, WC, Belzberg, H, Milzman, DP, et al (1998) Multicenter study of noninvasive monitoring systems as alternatives to invasive monitoring of acutely ill emergency patients.Chest114,1643-1651. [PubMed] [CrossRef]
 
Shoemaker, WC, Belzberg, H, Milzman, DP, et al Multicenter study of noninvasive monitoring systems as alternatives to invasive monitoring of acutely ill emergency patients.Chest1998;114,1643-52. [PubMed] [CrossRef]
 
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