Newcastle-Ottawa quality appraisal
| First author (year) . | Study design . | Selection . | Comparability . | Exposure/outcome . | Total of 9 . |
|---|---|---|---|---|---|
| Afolabi 200912 | Historical cohort | **** | * | * | 6 |
| Alayed 201324 | Historical cohort | *** | ** | * | 6 |
| Al Jama 200913 | Historical cohort | **** | ** | * | 7 |
| Al Kahtani 201214 | Historical cohort | **** | ** | * | 7 |
| Al Mulhim 200025 | Historical cohort | *** | * | * | 5 |
| Balgir 199715 | Historical cohort | * | ** | * | 4 |
| Barfield 201026 | Historical cohort | ** | * | ** | 5 |
| Boulet 201327 | Historical cohort | * | * | * | 3 |
| Daigavane 201316 | Prospective cohort | ** | * | * | 4 |
| Howard 199517 | Historical cohort | ** | * | * | 4 |
| Muganyizi 201328 | Historical cohort | *** | * | * | 5 |
| Natu 201429 | Historical cohort | ** | * | * | 4 |
| Ngo 201018 | Historical cohort | **** | * | ** | 7 |
| Rajab 200630 | Historical cohort | *** | * | ** | 6 |
| Serjeant 200419 | Prospective cohort | **** | ** | * | 7 |
| Serjeant 20056 | Prospective cohort | *** | ** | * | 6 |
| Sun 200120 | Historical cohort | *** | ** | * | 6 |
| Thame 201321 | Prospective cohort | *** | ** | * | 6 |
| Thame 200722 | Historical cohort | **** | * | ** | 7 |
| Villers 200831 | Historical Cohort | * | * | ** | 4 |
| Wilson 201223 | Historical Cohort | ** | * | ** | 5 |
| First author (year) . | Study design . | Selection . | Comparability . | Exposure/outcome . | Total of 9 . |
|---|---|---|---|---|---|
| Afolabi 200912 | Historical cohort | **** | * | * | 6 |
| Alayed 201324 | Historical cohort | *** | ** | * | 6 |
| Al Jama 200913 | Historical cohort | **** | ** | * | 7 |
| Al Kahtani 201214 | Historical cohort | **** | ** | * | 7 |
| Al Mulhim 200025 | Historical cohort | *** | * | * | 5 |
| Balgir 199715 | Historical cohort | * | ** | * | 4 |
| Barfield 201026 | Historical cohort | ** | * | ** | 5 |
| Boulet 201327 | Historical cohort | * | * | * | 3 |
| Daigavane 201316 | Prospective cohort | ** | * | * | 4 |
| Howard 199517 | Historical cohort | ** | * | * | 4 |
| Muganyizi 201328 | Historical cohort | *** | * | * | 5 |
| Natu 201429 | Historical cohort | ** | * | * | 4 |
| Ngo 201018 | Historical cohort | **** | * | ** | 7 |
| Rajab 200630 | Historical cohort | *** | * | ** | 6 |
| Serjeant 200419 | Prospective cohort | **** | ** | * | 7 |
| Serjeant 20056 | Prospective cohort | *** | ** | * | 6 |
| Sun 200120 | Historical cohort | *** | ** | * | 6 |
| Thame 201321 | Prospective cohort | *** | ** | * | 6 |
| Thame 200722 | Historical cohort | **** | * | ** | 7 |
| Villers 200831 | Historical Cohort | * | * | ** | 4 |
| Wilson 201223 | Historical Cohort | ** | * | ** | 5 |
Each asterisk corresponds to a score of one.