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| Variable | Filter OFF | Filter ON | p value |
|---|---|---|---|
| PEFR (L/min) | 326.24±67.54 | 321.33±63.38 | 0.620 |
| FeNO (ppb) | 27.76±16.87 | 28.5±18.97 | 0.874 |
PEFR, peak expiratory flow rate; FeNO, fractional exhaled nitric oxide.
Values are presented as a mean±standard deviation.
