Methodological quality of studies reporting mortality
| Study | Study design | Quality score | Quality assessment |
|---|---|---|---|
| Doupe et al22 | Retrospective cohort | NOS 6 | Moderate |
| Fuda and Immekus4 | Retrospective cohort | NOS 6 | Moderate |
| Hansagi et al24 | Prospective cohort | NOS 6 | Moderate |
| Jelinek et al27 | Retrospective cohort | NOS 6 | Moderate |
| Oostema et al36 | Prospective cohort | NOS 1 | Poor |
| Ruger et al39 | Retrospective cohort | NOS 6 | Moderate |
| Wajnberg et al42 | Cross-sectional | Loney 6 | Moderate |
NOS, Newcastle-Ottawa Scale.