Properties of the data sets
| Episodes, n | Patients, n | MDI episodes, n | MDI (%) | Study design | |
| Leeds | 48 | 27 | 9 | 19 | Prospective |
| Liverpool | 47 | 21 | 7 | 21 | Retrospective |
| Sheffield | 167 | 47 | 51 | 31 | Retrospective |
| Nottingham | 121 | 63 | 41 | 26 | Retrospective |
| Belgium | 27 | 16 | 5 | 19 | Prospective |
| Melbourne a | 101 | 54 | 18 | 18 | Retrospective |
| Melbourne b | 648 | 327 | 154 | 24 | Retrospective |
MDI, microbiologically documented infection