Table 2 

Variation in, and absolute stable Heart Rate, Oxygen Saturation and peakexpiratory flow (PEF) by patient and COPD disease characteristics; n = 31. 

Age^{1} 
Sex F vs. M^{2} 
Current Smoker vs. Not^{2} 
FEV_{1 }(% predicted)^{1} 
Exacerbation Frequency (previous yr)^{3} 



Mean Heart Rate (min^{1}) 
r = 0.28 
80 vs. 77 
77 vs. 78 
r = 0.26 
rho = 0.23 
p = 0.134 
p = 0.525 
p = 0.862 
p = 0.164 
p = 0.207 

SD Heart Rate (min^{1}) 
r = 0.39 
4.7 vs. 5.0 
4.5 vs. 4.9 
r = 0.35 
rho = 0.05 
p = 0.030* 
p = 0.724 
p = 0.713 
p = 0.054 
p = 0.797 

Mean Oxygen Saturation (%) 
r = 0.08 
94 vs. 95 
95 vs. 95 
r = 0.14 
rho = 0.21 
p = 0.688 
p = 0.358 
p = 0.644 
p = 0.470 
p = 0.266 

SD Oxygen Saturation (%) 
r = 0.17 
1.2 vs. 0.9 
1.0 vs. 1.0 
r = 0.21 
rho = 0.03 
p = 0.350 
p = 0.027* 
p = 0.769 
p = 0.267 
p = 0.862 

Mean PEF (lmin^{1}) 
r = 0.03 
198 vs. 248 
258 vs. 225 
r = 0.25 
rho = 0.09 
p = 0.858 
p = 0.085 
p = 0.378 
p = 0.172 
p = 0.647 

SD PEF (lmin^{1}) 
r = 0.02 
12 vs. 11 
10 vs. 12 
r = 0.10 
rho = 0.00 
p = 0.921 
p = 0.834 
p = 0.446 
p = 0.608 
p = 0.982 



(Statistics: ^{1}= Pearson correlation. ^{2}= t test. ^{3}= Spearman correlation). 

Hurst et al. BMC Pulmonary Medicine 2010 10:52 doi:10.1186/147124661052 