Table 4

Multiple linear regression analysis (n=28).

Variables in the model	R	R²	Adjusted R²	SE of the estimate	B	SE	P-value
%MIP, MEP, %MEP, The MGCS score	0.754	0.568	0.493	12.056	56.186	14.167	0.001
MEP, %MEP, The MGCS score	0.748	0.560	0.505	11.917	63.408	9.080	<0.001
%MEP, The MGCS score	0.731	0.535	0.498	11.999	61.704	9.022	<0.001
%MEP	0.702	0.493	0.473	12.285	51.566	6.128	<0.001

Dependent variable: %6MWD, Independent variables: MEP, %MEP, %MIP, the MGCS, MGCS - myastenia gravis composite scale, MIP - maximal inspiratory pressure, MEP - Maximal expiratory pressure, SE - standard error, R²=0.493, F_(1-27)=25.275, p<0.001, constant=51.566.