Table 1.
The Newcastle-Ottawa scale for quality assessment observational studies
| Trials | Representativeness cohort | Exposure Ascertainment | Comparability | Outcome Assessment | Sufficient Duration | Adequacy of follow up of cohorts |
|---|---|---|---|---|---|---|
| Kelly et al. | Yes | database | No restricton, Matched in 1,2,5,6 | record linkage | Yes | Yes |
| Choi et al. | Yes | database | Restricted to MCA, Matched in 1,2,5,6 | record linkage | Yes | Yes |
| Ayling et al. | Yes | database | No restricton, Matched in 1,2,4,5,6 | record linkage | No | Yes |
| Berro et al. | Yes | medical record | Restricted to MCA, Matched in 1,2,4 | record linkage | No | Yes |
| Darsaut et al. | Yes | database | No restricton | record linkage | Yes | Yes |
| Zanaty et al. | Yes | database | No restricton, Matched in 1,2,4,5,6 | record linkage | No | Yes |
| Heit et al. | Yes | medical record | Restricted to ACOA, Matched in 1,2,3 | record linkage | No | Yes |
| Scheller et al. | Yes | medical record | No restricton, Matched in 1,2,3, 6 | record linkage | Yes | Yes |
| Koh et al. | Yes | medical record | No restricton, Matched in 1,2,6 | record linkage | No | Yes |
| Shen et al. | Yes | medical record | Restricted to Anterior Circulation, Matched in 1,2,4,5 | record linkage | No | Yes |
| Zhao et al. | Yes | medical record | No restricton, Matched in 1,2,4,5,6 | record linkage | Yes | Yes |
| McDonald et al. | Yes | database | No restricton, Matched in 1,2 | record linkage | unclear | unclear |
| Li et al. | Ysa | medical record | No restricton, Matched in 1,2,4,5,6 | record linkage | Yes | Yes |
| Yu et al. | Yes | medical record | No restricton, Matched in 1,2,5 | record linkage | Yes | Yes |
| Bekelis et al. | Yes | database | No restricton, Matched in 1,2 | record linkage | Yes | Yes |
| Li et al. | Yes | medical record | No restricton, Matched in 1,2,3,5,6 | record linkage | Yes | Yes |
| Deutsch et al. | Yes | database | No restricton, Matched in 1,2 | record linkage | Yes | Yes |
| Ryttlefors et al. | Yes | medical record | Restricted to ≥65 years, Matched in 1,2,4,5,6 | record linkage | Yes | NO |
| Wadd et al. | Yes | medical record | Restricted to ACOA, Matched in 1,2,4 | record linkage | Yes | Yes |
| Hoh et al. | Yes | database | Restricted to ≥18 years, Matched in 1,2 | record linkage | unclear | unclear |
| Brunken et al. | Yes | medical record | No restricton, Matched in 1,2,3,6 | record linkage | NO | Yes |
| Taweesomboonyat et al. | Yes | medical record | Restricted to PCOA, Matched in 1,2,3,4,5,6 | record linkage | Yes | Yes |
| Zhao et al. | Yes | medical record | Restricted to ACOA, Matched in 1,2,4,5 | record linkage | Yes | Yes |
| Klompenhouwer et al | Yes | medical record | No restricton, Matched in 1,2,3,5,6 | record linkage | Yes | Yes |
| Liao et al. | Yes | medical record | Restricted to Anterior Circulation, Matched in 1,2,3,4 | record linkage | Yes | Yes |
| Zhang et al. | Yes | medical record | Restricted to 60 years, Matched in 1,2,3,6 | record linkage | Yes | Yes |
| Lusseveld et al. | Yes | medical record | Restricted to basilar tip aneurysm, Matched in 1,2,4,5 | record linkage | No | Yes |
| Varelas et al. | Yes | medical record | No restricton, Matched in 1,2,3,6 | record linkage | Yes | Yes |
| Hoh et al. | Yes | medical record | Restricted to age older than 18 | record linkage | Unclear | Unclear |
| Li et al. | Yes | medical record | No restricton | record linkage | Yes | Yes |
| Liu et al. | Yes | medical record | No restricton, Matched in 1,2,3,5 | record linkage | Yes | Yes |
| Gross et al. | Yes | medical record | No restricton, Matched in 1,2,3,6 | record linkage | Unclear | Unclear |
| Suzuki et al. | Yes | medical record | No restricton, Matched in 1,2,4,5,6 | record linkage | Yes | Unclear |
| Zaidat et al. | Yes | medical record | No restricton, Matched in 1,2,3,6 | record linkage | Unclear | Unclear |
| Niskanen et al. | Yes | medical record | No restricton, Matched in 1,2,3,5,6 | record linkage | Yes | Yes |
| Rabinstein et al. | Yes | medical record | No restricton, Matched in 1,2,4,6 | record linkage | Yes | Yes |
| Kim et al. | Yes | medical record | Restricted to anterior choroidal artery aneurysms, Matched in 1,2,3,5 | record linkage | Yes | Yes |
Note: 1 = Age; 2 = Sex; 3 = Hunt and Hess Grade; 4 = World Federation of Neurological Societies Scale; 5 = Aneurism size; 6 =Aneurism location