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Table 3 Correlations of Plethysmograph Estimate of Pulsus Paradoxus Physiology with %FEV1 and Airway Resistance

From: Noninvasive assessment of asthma severity using pulse oximeter plethysmograph estimate of pulsus paradoxus physiology

Outcome variable Baseline* (r, 95% CI) Baseline to 2 Hr change* (r, 95% CI) Baseline to 4 Hr change* (r, 95% CI)
%FEV1 -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) ¶
  1. Values are Spearman rank correlation coefficient unless otherwise specified.
  2. *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.
  3. †Percent predicted baseline value and proportionate change of this value at 2 and 4 hr
  4. ‡ Pearson correlation coefficient (95% confidence intervals)
  5. §Absolute baseline value (kPa/L/s) and proportionate change of this value at 2 and 4 hr
  6. ¶Numbers in parentheses are 95% confidence intervals derived using 1000 bootstrap replications.