Table 1.

Quality scores for spirometric maneuvers according to ATS/ERS standardization [9].

Scores	Maneuvers
Aa	3 acceptable maneuvers, and best 2 matched with differences in FVCband/or FEV1<150 ml
B	3 acceptable maneuvers, and best 2 matched with differences in FVCband/or FEV1 c<200 ml
C	2 acceptable maneuvers, and best 2 matched with differences in FVC and/or FEV1 c<250 ml
D	1 acceptable maneuver
F	No acceptable maneuvers

^aHigh quality spirometries, A and B scores, correspond to A, 3 acceptable maneuvers with differences in FVC and/or FEV₁<150 ml; and B, 3 acceptable maneuvers with differences in FVC and/or FEV₁<200 ml; C, to high variability among maneuvers; D, only one acceptable maneuver; and F no acceptable maneuver.

^bFVC = forced vital capacity

^cFEV₁= forced expiratory volume in the first second