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
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.
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.
Become a CHEST member and receive a FREE subscription as a benefit of membership.
Individuals can purchase this article on ScienceDirect.
Individuals can purchase a subscription to the journal.
Individuals can purchase a subscription to the journal or buy individual articles.
Learn more about membership or Purchase a Full Subscription.
Institutional access is now available through ScienceDirect and can be purchased at myelsevier.com.
Some tools below are only available to our subscribers or users with an online account.
Download citation file:
Web of Science® Times Cited:
Customize your page view by dragging & repositioning the boxes below.
Enter your username and email address. We'll send you a reminder to the email address on record.
Athens and Shibboleth are access management services that provide single sign-on to protected resources. They replace the multiple user names and passwords necessary to access subscription-based content with a single user name and password that can be entered once per session. It operates independently of a user's location or IP address. If your institution uses Athens or Shibboleth authentication, please contact your site administrator to receive your user name and password.