A retrospective analysis of usefulness of impulse oscillometry system in the treatment of asthma

Respiratory Research

Table 4 Correlation between impulse oscillometry system and spirometric parameters without grouping

		%FVC	%FEV1	FEV1/FVC ratio	%MMEF	%PEF
R5	r	0.3	0.42	0.46	0.45	0.54
R5	P	0.0013**	5.3E–06**	6.9E–07**	7.8E–07**	2.3E–09**
R20	r	0.02	0.06	0.07	0.11	0.27
R20	P	0.85	0.54	0.44	0.24	0.005**
R5 − R20	r	0.36	0.52	0.58	0.54	0.52
R5 − R20	P	0.0005**	1.2E–08**	9.0E–09**	2.9E–09**	6.9E–09**
X5	r	0.51	0.62	0.61	0.54	0.64
X5	P	2.3E–08 **	9.9E–13**	1.2E–12**	1.8E–09**	9.0E–14**
Fres	r	0.45	0.61	0.65	0.6	0.55
Fres	P	8.6E–07**	2.2E–12**	4.4E–14**	4.1E–10**	6.7E–10**
AX	r	0.47	0.61	0.62	0.55	0.61
AX	P	2.2E–07**	4.1E–12**	5.7E–13**	6.5E–10**	3.3E–12**

Data were presented as the Pearson correlation coefficient (r) and p-value (P) via a linear regression analysis. **: p < 0.01

ISSN: 1465-993X