Table 2.

Within test and within day variability

	Mean (SD)		Coefficient of variation (%)
	Test 1	Test 2	Within test	Within day
R5 (kPa l−1 s)	0.58 (0.06)	0.57 (0.05)	8.4	13.5
R20 (kPa l−1 s)	0.35 (0.03)	0.34 (0.02)	7.7	11.6
X5 (kPa l−1 s)	0.28 (0.04)	0.30 (0.03)	11.9	36.0
RF (Hz)	24.44 (1.13)	24.30 (1.26)	5.0	7.4
Raw (kPa l−1 s)	0.40 (0.04)	0.39 (0.04)	10.0	10.3
sGaw (kPa−1 s−1)	0.64 (0.06)	0.63 (0.05)	9.3	7.8
FEV1 (l)	1.70 (0.06)	1.75 (0.05)	3.3	3.5
FVC (l)	3.21 (0.12)	3.28 (0.08)	3.3	6.3
MMEF (l s−1)	0.54 (0.07)	0.58 (0.04)	9.5	11.1
TLC (l)	6.24 (0.12)	6.26 (0.13)	2.1	3.4
RV (l)	3.27 (0.08)	3.26 (0.08)	2.4	7.7
IC (l)	2.22 (0.08)	2.16 (0.06)	3.2	6.6