Table 1 Frequency distribution of selected characteristics of study subjects by the case-control status
Variable | Controls (n = 824) | Cases (n = 766) | Pvaluea |
|---|---|---|---|
| Â | No. (%) | No. (%) | Â |
Age (mean ± SD) (y) | 41.5 ± 18.4 | 42.2 ± 16.0 | 0.439 |
Age (y) | 0.353 | ||
   Children(≤18) | 60(7.3) | 66(8.6) |  |
   Adults(>18) | 764(92.7) | 700(91.4) |  |
Gender | 0.919 | ||
   Male | 490(59.5) | 453(59.1) |  |
   Female | 334(40.5) | 313(40.9) |  |
Smoking status | 0.535 | ||
   Never | 490(60.6) | 394(62.0) |  |
   Former | 120(14.8) | 81(12.8) |  |
   Current | 199(24.6) | 160(25.2) |  |
Family history of cancer | Â | ||
   No | 626(84.5) | 496(79.7) | 0.027 |
   Yes | 115(15.5) | 126(20.3) |  |
Histology | Â | ||
   Glioblastoma | 241(31.5) |  |  |
   Astrocytomasb | 284(37.0) |  |  |
   Other gliomasc | 241(31.5) |  |  |