Table 1.
Variables | Subjects, No. | Three Efforts ≥ 6 s and Without EBEV | Without Acceptable Efforts | p Value |
---|---|---|---|---|
% Predicted FVC | 271 | 78.5 ± 17.9 (n = 227) | 65.5 ± 17.4 (n = 44) | < 0.0001 |
% Predicted FEV1 | 271 | 75.1 ± 18.2 (n = 227) | 68.8 ± 17.8 (n = 44) | 0.0370 |
MIP, cm H2O | 258 | 89.2 ± 33.3 (n = 216) | 76.3 ± 32.4 (n = 42) | 0.0215 |
MEP, cm H2O | 135 | 96.9 ± 40.7 (n = 115) | 75.3 ± 30.0 (n = 20) | 0.0248 |
Expiratory efforts, No. | 278 | 6.1 ± 2.9 (n = 230) | 7.8 ± 3.8 (n = 48) | 0.0053 |
% With > 8 efforts | 278 | 17.4 (n = 40) | 37.5 (n = 18) | 0.0018 |
Subjects who could not produce three efforts ≥ 6 s without EBEV attempted more expiratory efforts and had a lower mean MIP, MEP, and percentage of predicted FVC and FEV1. Percentage of predicted FVC and FEV1 were calculated for 271 of 278 subjects. Two subjects with race other than white or African American were excluded, and one subject with SCI due to a birth injury was excluded because it was not possible to accurately assess stature. In four subjects, none of the expiratory efforts was technically acceptable, so it was not possible to report a value for FVC or FEV1.