RT Journal
A1 Jay SJ
T1 SMoking is an important component in the analysis of heart failure
JF Archives of Internal Medicine
JO Archives of Internal Medicine
YR 1999
FD October 11
VO 159
IS 18
SP 2225
OP 2226
DO 
UL http://dx.doi.org/
AB 
The authors could only speculate on the possible determinants of observed differences in outcomes because of limitations in the information contained in the MDBs. The lack of patient data regarding functional status, severity of disease, and physiologic indicators limited their analyses. Another deficiency of the MDBs, not mentioned by Croft et al, was the absence of information regarding smoking and exposure to secondhand smoke of patients with heart failure. This deficiency made it difficult to interpret data regarding variation in prognosis.