Table 2.
Results for the First and Second Inhalation Effortsa
| First inhalation | Second inhalation | Difference (second–first inhalation) | SD of differences / average over both inhalations | Intrasubject coefficient of variation | |
|---|---|---|---|---|---|
| Mean PIF (±SD) liters/min | 26.74 (6.06) | 26.25 (6.23) | −0.50 (2.46) | 0.09 | 0.07 |
| Mean PIP (±SD) kPa | 8.49 (2.86) | 8.10 (2.99) | −0.39 (1.00) | 0.12 | 0.09 |
| Mean Pavg (±SD) kPa | 6.53 (2.24) | 6.09 (2.08) | −0.41 (0.78) | 0.12 | 0.10 |
a
The intrasubject SD was computed by averaging the variances of the two inhalations of each subject and then taking the square root. The coefficient of variation was computed as the ratio of the SD to the overall mean.