Mean (SD) PEF, FEV1/FVC% and number of mistakes at each visit
| 1st visit | 2nd visit | 3rd visit | Overall p value | |
|---|---|---|---|---|
| PEF overall (L/min)§ | 76.1 (32.4) | 78.5 (23.2) | 82.8 (31.2) | <0.001 |
| PEF GP1 (L/min)* | 75.6 (32.6) | 76.6 (22.2) | 82.4 (29.1) | <0.001 |
| PEF GP2 (L/min) | 79.0 (37.0) | 78.5 (23.4) | 80.8 (32.3) | NS |
| PEF GP3 (L/min)† | 77.0 (29.6) | 80.8 (22.4) | 86.5 (29.3) | <0.001 |
| PEF GP4 (L/min)†,‡ | 67.7 (29.5) | 73.9 (25.7) | 75.7 (35.9) | 0.007 |
| FEV1/FVC overall (%)* | 78.2 (16.2) | 79.8 (13.8) | 87.1 (13.8) | <0.001 |
| FEV1/FVC GP1 (%)* | 77.7 (15.8) | 79.6 (14.3) | 86.6 (14.8) | <0.001 |
| FEV1/FVC GP2 (%)* | 80.5 (14.2) | 81.4 (12.5) | 88.7 (12.1) | <0.001 |
| FEV1/FVC GP3 (%)* | 79.0 (16.2) | 80.1 (13.6) | 88.3 (12.5) | <0.001 |
| FEV1/FVC GP4 (%)* | 71.7 (18.7) | 76.0 (16.0) | 80.9 (17.6) | <0.001 |
| Number of mistakes overall | 4.3 (1.1) | 3.5 (1.1) | 2.5 (1.1) | <0.001 |
| Number of mistakes GP1 | 4.6 (1.0) | 3.8 (1.2) | 2.6 (1.1) | <0.001 |
| Number of mistakes GP2 | 4.4 (1.0) | 3.7 (1.1) | 2.7 (1.0) | <0.001 |
| Number of mistakes GP3 | 4.2 (1.1) | 3.4 (1.1) | 3.3 (1.3) | <0.001 |
| Number of mistakes GP4 | 4.5 (1.3) | 3.5 (1.0) | 2.5 (1.2) | <0.001 |
*No significant difference between first and second visits,
†p<0.05 between first and second visits.
‡No significant difference between second and third visits,
§p<0.01 between first and second visits. Friedman test followed by Wilcoxon test.
FVC, forced vital capacity; PEF, peak expiratory flow; NS, no significant difference,