Table 1.
Population characteristics by case‐control status and tumor grade: The Glioma International Case‐Control Study (GICC)
| Case | Control | High‐Grade Casesa | Lower Grade Casesa | |
|---|---|---|---|---|
| No.(%) | No.(%) | No.(%) | No.(%) | |
| Sex | ||||
| Male | 2679 (59.1) | 2351 (56.37) | 1728 (62.29) | 916 (54.3) |
| Female | 1854 (40.9) | 1820 (43.63) | 1046 (37.71) | 771 (45.7) |
| Diagnosis/enrollment age | ||||
| 18–29 years | 308 (6.79) | 294 (7.05) | 62 (2.24) | 228 (13.52) |
| 30–39 years | 521 (11.49) | 473 (11.34) | 108 (3.89) | 398 (23.59) |
| 40–49 years | 813 (17.94) | 680 (16.3) | 417 (15.03) | 384 (22.76) |
| 50–59 years | 1150 (25.37) | 1079 (25.87) | 796 (28.7) | 338 (20.04) |
| 60–69 years | 1239 (27.33) | 1098 (26.32) | 993 (35.8) | 238 (14.11) |
| 70–80 years | 502 (11.07) | 547 (13.11) | 398 (14.35) | 101 (5.99) |
| Educationb | ||||
| Less than high school | 1127 (27.53) | 912 (22.45) | 717 (28.55) | 392 (25.82) |
| Some college | 1107 (27.05) | 1295 (31.88) | 653 (26.01) | 434 (28.59) |
| Bachelor's degree | 1031 (25.19) | 958 (23.58) | 600 (23.89) | 415 (27.34) |
| Advanced degree | 816 (19.94) | 893 (21.98) | 535 (21.31) | 271 (17.85) |
| Missing | 12 (0.29) | 4 (0.1) | 6 (0.24) | 6 (0.4) |
| Race/ethnicity | ||||
| Non‐Hispanic white | 4163 (91.84) | 3691 (88.49) | 2577 (92.9) | 1522 (90.22) |
| Non‐Hispanic black | 71 (1.57) | 139 (3.33) | 41 (1.48) | 26 (1.54) |
| Asian | 84 (1.85) | 87 (2.09) | 35 (1.26) | 48 (2.85) |
| Hispanic | 162 (3.57) | 224 (5.37) | 93 (3.35) | 67 (3.97) |
| Other | 38 (0.84) | 26 (0.62) | 22 (0.79) | 15 (0.89) |
| Missing | 15 (0.33) | 4 (0.1) | 6 (0.22) | 9 (0.53) |
| Total | 4533 (100) | 4171 (100) | 2774 (100) | 1687 (100) |
a
The sum of the high‐grade and lower grade cases is not equal to the total number of cases because of unclassified cases.
b
One site (UK) did not collect education information.