Table 1. Baseline characteristics of included studies.
| Study | Design | Location | Patient Number | Mean age | Male | HTN | DM | HD | Smoking | Mean stenosis | Center volume | Basilar artery lesions | Stents system | Follow-up | Quality scores |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| years | % | % | % | % | % | % | case/year | % | % | months | |||||
| Gomez 2000 | RC | USA | 12 | 62.6 | 83.3 | NR | NR | NR | NR | 71.4 | 12 | 100 | Coronary stents | 5.9 | 4 |
| Levy 2001 | RC | USA | 11 | 62.9 | 100 | 72.7 | 9 | 27.3 | 45.5 | > 70 | 5.5 | 72.7 | Coronary stents | 4 | 4 |
| Kim 2005 | RC | Korea | 17 | 64 | 58.8 | 100 | 35.3 | 29.4 | 35.3 | 76.1 | 5.7 | 46.2 | Coronary stents | 17 | 4 |
| Weber 2005 | RC | Germany | 21 | 67 | 71.4 | NR | NR | NR | NR | 92.3 | 11 | 40.9 | Coronary stents | 9 | 4 |
| Yu 2005 | RC | USA | 18 | 69 | 83.3 | 83 | 50 | 72 | 33 | 79.6 | 4.5 | 100 | Coronary stents | 12.1 | 4 |
| Abruzzo 2007 | RC | USA | 10 | 68.3 | 80 | 90 | 40 | 30 | 20 | 80.7 | 2.5 | 100 | Coronary stents | 31 | 4 |
| Steinfort 2007 | RC | Australia | 13 | 60 | 100 | NR | NR | NR | NR | 67 | 6.5 | 38.5 | Paclitaxel-coated stents | 10.3 | 4 |
| Fiorella 2007 | RC | USA | 44 | 64.8 | 79.5 | NR | NR | NR | NR | 82.5 | 7.3 | NR | Velocity, Duet, Tetra and Vision stents | 43.5 | 4 |
| Ralea 2008 | PC | France | 12 | 62.6 | 66.7 | 91.7 | 25 | 100 | 25 | 80 | 2 | 50 | Tsunami, INX, Cérébrence and Wingspan stents | 15 | 4 |
| Seifert 2009 | RC | Austria | 17 | 65.9 | 70.6 | NR | NR | NR | NR | NR | 3.4 | NR | Coronary stents or self-expanding nitinol stents | 12.7 | 4 |
| Povedano 2010 | RC | Argentina | 25 | 63 | 84 | 84 | 24 | 60 | 40 | NR | 2.5 | 32 | AVE INX and AVE GFX; Cypher, Sonic, and Velocity; Express and Neuroform; Taxus Express; Herculink and MultiLink Pixel; and Wingspan stents | 12 | 4 |
| Jiang 2010 | PC | China | 139 | 59 | 92.1 | 78.4 | 28.8 | 80.6 | 66.2 | 81 | 19.8 | 50 | Wingspan stents | 24.9 | 5 |
| Li 2012 | RC | China | 30 | 60.3 | 83.3 | 86.7 | 40 | 16.7 | 46.7 | 82.3 | 10 | 46.7 | Wingspan stents | 17.8 | 4 |
| Wang 2015 | PC | China | 88 | 62.6 | 75 | 77.3 | 52.3 | 50 | 34.1 | 82.2 | 14.6 | 40.9 | Wingspan stents | 29.3 | 5 |
| Liu 2016 | PC | China | 97 | 58.5 | 82.1 | 82.4 | 28.9 | 44.3 | 61.9 | 84.2 | 48.5 | 53.6 | Apollo and Wingspan stents | 1 | 5 |
RC, retrospective cohort; PC, prospective cohort; HTN, hypertension; DM, diabetes mellitus; HD, hyperlipidemia; NR, not reported