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

Table 3 Correlations of Plethysmograph Estimate of Pulsus Paradoxus Physiology with %FEV₁ 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)
%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) ¶

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.

ISSN: 1471-2466