Table 3 

Correlations of Plethysmograph Estimate of Pulsus Paradoxus Physiology with %FEV_{1 }and Airway Resistance 

Outcome variable 
Baseline* (r, 95% CI) 
Baseline to 2 Hr change* (r, 95% CI) 
Baseline to 4 Hr change* (r, 95% CI) 


%FEV_{1}† 
0.44 (0.56, 0.30)‡ 
0.31(0.5, 0.09) 
0.38 (0.62, 0.07) 
Airway resistance 

Age 5  10 yr† 
0.28 (0.12, 0.42)‡ 
0.06 (0.16, 0.28) ¶ 
0.19 (0.13, 0.51) ¶ 
Ages ≥ 11 yr§ 
0.45 (0.23, 0.63)‡ 
0.21 (0.13, 0.52) ¶ 
0.25 (0.24, 0.66) ¶ 


Values are Spearman rank correlation coefficient unless otherwise specified. *Baseline value is before corticosteroid (CCS) administration. Two and 4 hour time points are times from CCS administration. Correlations at 2 and 4 Hr are for proportionate changes of PEP. †Percent predicted baseline value and proportionate change of this value at 2 and 4 hr ‡ Pearson correlation coefficient (95% confidence intervals) §Absolute baseline value (kPa/L/s) and proportionate change of this value at 2 and 4 hr ¶Numbers in parentheses are 95% confidence intervals derived using 1000 bootstrap replications. 

Arnold et al. BMC Pulmonary Medicine 2010 10:17 doi:10.1186/147124661017 