Study Characteristics
| Study no. | Reference | Year | No. of patients | No. of patients excluded | Age (y) | Sex ratio (F:M) | No. of patients with tumors | No. of patients with gliomas | Time (min) |
| 1* | Pauleit et al. (17) | 2004 | 20 | 6 (30) | 53 ± 11 | 12:2 | 12 (60) | 11 (55) | 15–40 |
| 2 | Weckesser et al. (19) | 2005 | 44 | 9 (20) | 45 ± 22 | 15:20 | 31 (70) | 24 (55) | 30–40 |
| 3 | Pauleit et al. (20) | 2005 | 28 | 0 (0) | 42 ± 20 | 19:09 | 23 (82) | 23 (82) | 15–40 |
| 4* | Floeth et al. (22) | 2005 | 50 | 0 (0) | 44 ± 17 | 29:21 | 34 (68) | 34 (58) | 15–40 |
| 5* | Floeth et al. (14) | 2006 | 14 | 0 (0) | 55 ± 12 | 1:13 | 5 (36) | 5 (36) | 15–40 |
| 6 | Pöpperl et al. (7) | 2007 | 54 | 0 (0) | 49 ± 17 | 26:28 | 54 (100) | 54 (100) | 20–40 |
| 7 | Floeth et al. (15) | 2007 | 33 | 0 (0) | 41 ± 9 | 13:20 | 33 (100) | 33 (100) | 15–40 |
| 8 | Stockhammer et al. (23) | 2008 | 22 | 0 (0) | 43 ± 13 | 13:9 | 22 (100) | 22 (100) | 10–30 |
| 9* | Pauleit et al. (16) | 2009 | 52 | 10 (19) | 46 ± 13 | 16:26 | 34 (65) | 33 (65) | 30–50 |
| 10 | Benouaich-Amiel et al. (24) | 2010 | 12 | 0 (0) | — | — | 12 (100) | 11 (92) | — |
| 11* | Pichler et al. (18) | 2010 | 88 | 28 (32) | — | — | 59 (67) | 51 (59) | — |
| 12 | Plotkin et al. (25) | 2010 | 15 | 4 (27) | 44 ± 12 | 7:4 | 11 (73) | 11 (73) | 10–40 |
| 13 | Floeth et al. (21) | 2011 | 30 | 4 (13) | 42 ± 11 | 9:17 | 26 (87) | 26 (87) | 15–45 |
| Metaanalysis subtotal | 224 | 44 (20) | 47 ± 15 | 58:62 | 144 (80) | 134 (74) | — | ||
| Overall total | 462 | 61 (13) | 45 ± 11 | 1:0.7 | 356 (77) | 338 (73) | — |
↵* Included in metaanalysis.
Data in parentheses are percentages, and age is mean ± SD.