Evidence based guideline for the performance of the sweat test for the investigation of cystic fibrosis
| Recommendation grade | Level of evidence | Description of evidence |
|---|---|---|
| Grade A | Ia | Evidence obtained from meta-analysis of randomised controlled trials |
| Ib | Evidence obtained from at least one randomised controlled trial | |
| Grade B | IIa | Evidence obtained from at least one well designed controlled study without randomisation |
| IIb | Evidence for at least one other type of quasi-experimental descriptive studies | |
| III | Evidence obtained from well designed, non-experimental descriptive studies such as comparative studies, correlation studies, and case studies | |
| Grade C | IV | Evidence obtained from expert committee reports or opinions and/or clinical experience of respected authorities |