Airwave oscillometry and spirometry in children with asthma or wheeze

Figures & data

Table 1. Demographics of study population.

Participants, n (male)	47 (26)
Age (years)	8.8 (5.4–16.9)
Height (cm)	134 (105–176)
Weight (kg)	32.3 (14.7–81.6)
Number < 12 years	36 (77%)
Number ≥ 12 years	11 (23%)

Data are presented as n (%) or median (range).

Figure 1. Bland-Altman plot for FEV1 z-scores paired with R5 z-scores, Regression equation: y = −0.73 + 1.6x.

Table 2. Correlation of AOS parameters and spirometry parameters at baseline.

Pre-bronchodilator AOS versus spirometry	R value	P value
R5 versus FEV1	0.488	0.004
R5 versus FEV1/FVC	0.618	<0.001
R5 versus FEF75	0.617	<0.001
R5-20* versus FEV1	0.419	0.015
R5-20* versus FEV1/FVC	0.568	<0.001
R5-20* versus FEF75	0.529	0.002
AX versus FEV1	0.68	<0.001
AX versus FEV1/FVC	0.574	0.007
AX versus FEF75	0.618	0.003

All variables are z-scores unless stated otherwise.

* Raw values used instead of z-scores.

Table 3. Correlation of delta change in AOS and delta change in spirometry results.

ΔAOS versus Δspirometry measures	R value	P value
ΔR5 versus ΔFEV1	−0.574	<0.001
ΔR5 versus ΔFEV1/FVC	−0.577	<0.001
ΔR5 versus ΔFEF75	−0.424	0.015
ΔR5-20 versus ΔFEV1	−0.178	0.331
ΔR5-20 versus ΔFEV1/FVC	−0.391	0.027
ΔR5-20 versus ΔFEF75	0.018	0.924
ΔAX versus ΔFEV1	−0.512	0.003
ΔAX versus ΔFEV1/FVC	−0.487	0.005
ΔAX versus ΔFEF75	−0.376	0.034