Table 2.

Populations of healthy children studied using forced oscillation technique since 2005, adopted and modified from

Ref.	Year of publication	Ethnic group - Country of study	Subject number	Age in years	Height (cm)	Reported prediction equation variables
Frei et al[35]	2005	Caucasian - Canadian	222	3-10	90-155	Rrs at 5-35 Hz Xrs at 5-35 Hz Fres, AX
Dencker et al[36]	2006	Caucasian - Scandinavian	360	2-11	90-162	Rrs at 5-20 Hz Xrs at 5-20 Hz Fres
Amra et al[37]	2008	Asian - Iranian	509	5-18	127-197	Rrs at 5-25 Hz Xrs at 5-25 Hz
Nowowiejska et al[38]	2008	Caucasian - Polish	626	3-18	95-193	Rrs at 5-35 Hz Xrs at 5-35 Fres
Vu et al[39]	2008	Asian - Vietnamese	175	6-11	111-154	Rrs at 8 Hz Xrs at 8 Hz
Vu et al[40]	2010	Asian - Vietnamese	95	6-11	111-134	Rrs at 8 Hz Xrs at 8 Hz
Calogero et al[41]	2010	Italian	163	2-6	101-114	Rrs at 6-10 Hz Xrs at 6-10 Hz
Park et al[42]	2011	Korean	133	3-6	95-121	Rrs at 5, 10 Xrs at 5, 10 RF, AX
Calogero et al[43]	2013	Caucasian Italian and Australian	760	2-13	90-160	Rrs at 6, 8, 10 Hz Xrs at 6, 8, 10 Hz Fres, AX
Shackleton et al[44]	2013	Mexican	584	3-5	87-119	Rrs at 6 and 8 Hz Xrs at 6 and 8 Hz
Hagiwara et al[46]	2014	Japanese	537	6-15	111-174	Rrs at 5 and 20 Hz Rrs5-20

IOS: Impulse oscillation system; Rrs: Respiratory system resistance; Xrs: Respiratory system reactance) in hPa/s per L; Fres: Resonant frequency; RF: Resonant frequency; AX: Area under the Xrs curve from 5 Hz to Fres; MF: Multi-frequency system; Fdep: Frequency dependence of Rrs between 4–24 Hz; SF: Single frequency system.