| Average peak expiratory flow rate (PEFR) | |
| Study | Narrative reported results |
| Belsky 1994 | The mean PEFR score showed an increase of approximately 76 points from pre‐ to post‐test in the experimental group, whereas it dropped approximately 12 points in the control group. This difference proved to be significant (U=0, p<.001). The difference between the two groups was also significant at the 4‐month follow up. |
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