Is forced oscillation technique the next respiratory function test of choice in childhood asthma

Table 1 Fifteen minutes’ repeatability of Forced oscillation technique in healthy children

Author	Year	n	Rrs	Xrs
Hall et al[13]	2007	58; field	~2 or ~ 30%	1.2 - 1.7
Malmberg et al[18]	2002	19; placebo	1.1 or ~ 12%	1.3
Klug et al[16]	1998	120	2.6 or ~ 20%	2

Rrs: Respiratory system resistance; Xrs: Respiratory system reactance) in hPa/s per L.