| CF | Cystic Fibrosis |
| FC | Fecal calprotectin |
| FEV1 | Forced expiratory volume in one second |
| FVC | Forced vital capacity |
| FEF25–75 | Forced mid-expiratory flow between 25% and 75% of forced vital capacity |
| GI | Gastrointestinal |
| IBD | Inflammatory bowel diseases |
| IQR | Interquartile range |
| QoL | Quality of life |
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