Volume expired during 1.0 s of forced expiration/Volume expired during 6.0 s of forced expiration
volume expired during 1.0 s of forced expiration/volume expired during 6.0 s of forced expiration
Volume expired during 1.0 s of forced expiration/Volume expired during 6.0 s of forced expiration
volume expired during 1.0 s of forced expiration/volume expired during 6.0 s of forced expiration