| Serial number | Author | Study location | Date of publication | Total cases | Number of cases of postoperative CSF Leak (%) | Factors | Quality score (points) |
| 1 | Ivan et al. [10] | California, USA | 2015 | 98 | 11 (11.2) | (a) | 6 | 2 | Fraser et al. [14] | Pennsylvania, USA | 2018 | 615 | 103 (16.7) | (b) and (c) | 6 | 3 | Patel et al. [15] | Vanderbilt, USA | 2018 | 806 | 38 (4.7) | (b), (c), and (d) | 5 | 4 | Zhang et al. [11] | Shanghai, China | 2017 | 474 | 13 (2.7) | (a) and (e) | 5 | 5 | Karnezis et al. [16] | Multicenters of Australia, Canada, and USA | 2016 | 1161 | 68 (5.9) | (b), (d), and (h) | 7 | 6 | Q. Liu et al. [12] | Xuzhou, China | 2020 | 194 | 25 (12.9) | (a), (d), and (f) | 5 | 7 | Tian et al. [13] | Yantai, China | 2018 | 1063 | 29 (2.7) | (a), (d), (e), (f), and (h) | 5 | 8 | Sun et al. [17] | Singapore | 2018 | 123 | 10 (8.1) | (b) | 6 | 9 | Liu et al. [22] | Guangdong, China | 2012 | 397 | 31 (7.8) | (e) and (f) | 5 | 10 | Hannan et al. [18] | Austria | 2020 | 270 | 24 (9) | (b) and (f) | 5 | 11 | Dlouhy et al. [19] | Iowa, USA | 2012 | 96 | 13 (13.5) | (b), (d), (e), and (f) | 6 | 12 | Lee et al. [20] | Los Angeles, USA | 2020 | 78 | 14 (17.9) | (b), (d), (g), and (h) | 6 | 13 | Han et al. [21] | Guangzhou, China | 2008 | 592 | 26 (4.4) | (b), (e), and (f) | 6 |
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