RT Journal
A1 Manning DM
T1 REspiratory rate and diagnosis of pleural effusion
JF JAMA
JO JAMA
YR 2009
FD May 20
VO 301
IS 19
SP 1989
OP 1990
DO 10.1001/jama.2009.653
UL http://dx.doi.org/10.1001/jama.2009.653
AB 
Although there is interobserver variability in the measurement of respiratory rate,3 it is a legitimate part of the physical examination. It would be surprising if the sensitivity, specificity, and predictive accuracy of respiratory rate for pleural effusion have never been studied.