Table 2.
Heterogeneity, publication bias, and the overall prevalence of tumors studied in the study based on meta-analysis and random analysis
| Tumor type | Number of articles | Sample size | Heterogenicity (I2) | Publication bias (Begg and Mazumdar rank correlation test) | Prevalence (95% CI) |
|---|---|---|---|---|---|
| Pituitary adenomas | 26 | 331,575 | 99.6 | 0.566 | 12.2 (95% CI: 9.4–15.7) |
| Glioma | 27 | 303,967 | 99.9 | 0.113 | 42.8 (95% CI: 29–57.7) |
| Embryonal tumors | 14 | 207,577 | 99.3 | 0.742 | 3.1 (95% CI: 2.1–4.5) |
| Ependymal tumors | 33 | 379,800 | 99.7 | 0.258 | 3.2 (95% CI: 2.3–4.4) |
| Meningioma | 42 | 450,109 | 99.7 | 0.438 | 24.1 (95% CI: 20.5–28.1) |
| Glial tumor of CNS and pineal gland | 17 | 228,500 | 99.4 | 0.692 | 0.8 (95% CI: 0.4–1.5) |
| Astrocytic tumors of CNS | 33 | 375,302 | 99.9 | 0.744 | 20.3 (95% CI: 15–26.8) |
| Oligodendroglial | 34 | 387,350 | 99.5 | 0.802 | 3.9 (95% CI: 3.1–4.9) |
| Choroid plexus | 16 | 219,897 | 98.5 | 0.444 | 0.4 (95% CI: 0.2–0.7) |
| Tumors of neuroepithelial tissue | 14 | 162,538 | 99.8 | 0.324 | 34.7 (95% CI: 28.6–41.3) |
| Glioblastoma | 26 | 616,726 | 99.9 | 0.133 | 17.7 (95% CI: 13.9–22.3) |
| Germ cell tumors | 16 | 104,207 | 99.7 | 0.115 | 2.6 (95% CI: 0.8–8.2) |
| Brain tumor | 8 | 314,938 | 99.2 | 0.710 | 70.9 (95% CI: 63.1–77.5) |
| Spinal tumor | 7 | 108,524 | 99.9 | 1.000 | 12.2 (95% CI: 5–27.1) |
| Schwannoma | 6 | 65,400 | 93.3 | 0.259 | 6.7 (95% CI: 5.3–8.4) |
| Medulloblastoma | 19 | 172,593 | 99.6 | 0.093 | 7.7 (95% CI: 4.2–13.6) |
| Pilocytic astrocytomas | 16 | 427,683 | 99.7 | 0.162 | 3.8 (95% CI: 2.3–6.5) |