Table 2.

Variability of plethysmography, IOS and spirometry

			Coefficient of variation (%)
	Test 1 Mean(SD)	Test 2 Mean(SD)	Within test	Within Day
(a) Healthy volunteers
sGaw	2.17	2.17	6.03	13.76
s−1 kPa−1	(0.44)	(0.41)
R5	0.31	0.33	6.96	5.97
kPaL−1.s	(0.13)	(0.13)
R20	0.3	0.31	6.48	7.38
kPaL−1.s	(0.13)	(0.11)
X5	0.11	0.12	8.67	14.70
kPaL−1.s	(0.04)	(0.05)
RF	10.23	10.27	4.86	12.05
Hz	(1.53)	(2.75)
FEV1	3.26	3.29	1.66	1.25
L	(0.42)	(0.42)
MMEF	2.99	3.07	2.99	8.88
l−1	(0.85)	(0.76)
(b) Mild asthma
sGaw	1.49	1.47	11.32	12.89
s−1 kPa−1	(0.61)	(0.59)
R5	0.52	0.50	5.05	7.65
kPaL−1.s	(0.2)	(0.17)
R20	0.42	0.4	4.17	2.48
kPaL−1.s	(0.13)	(0.10)
X5	0.18	0.16	10.45	19.52
kPaL−1.s	(0.12)	(0.08)
RF	16.57	16.04	7.22	5.05
Hz	(7.11)	(7.18)
FEV1	2.71	2.70	2.16	2.33
L	(0.89)	(0.89)
MMEF	1.90	1.94	8.00	6.28
l−1	(1.06)	(1.07)