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PEF results of the treatment and control groups (l/min).
| Variable | Baseline | Year 1 | Year 2 | Year 3 |
|---|---|---|---|---|
| Treatment group | 63.3±5.4 | 72.5±6.3 | 87.4±9.2 | 91.3±5.8 |
| Control group | 62.3±5.1 | 69.4±4.8 | 73.5±5.1 | 81.6±4.5 |
| t-value | 0.941 | 1.346 | 2.324 | 2.769 |
| P-value | 0.074 | 0.063 | 0.018 | 0.007 |
PEF, peak expiratory flow.
