Table 1. Selected demographic and exposure characteristics of cancer-free controls and SGC cases.
| Controls(No. = 511) | Cases(No. = 156) | ||||
| Characteristic | No. | (%) | No. | (%) | P a |
| Age, years | <0.001 | ||||
| <48 | 246 | (48.1) | 51 | (32.7) | |
| ≥48 | 265 | (51.9) | 106 | (67.3) | |
| Sex | 0.169 | ||||
| Male | 245 | (47.9) | 65 | (41.7) | |
| Female | 266 | (52.1) | 91 | (58.3) | |
| Race/ethnicity | 0.943 | ||||
| Non-Hispanic white | 401 | (78.5) | 122 | (78.2) | |
| Other | 110 | (21.5) | 34 | (21.8) | |
| First-degree family history of cancerb | 0.334 | ||||
| Yes | 257 | (51.4) | 86 | (55.8) | |
| No | 243 | (48.6) | 68 | (44.2) | |
| Smokingb | 0.307 | ||||
| Ever | 213 | (42.1) | 72 | (46.8) | |
| Never | 293 | (57.9) | 82 | (53.2) | |
| Alcohol drinkingb | 0.764 | ||||
| Ever | 246 | (48.6) | 77 | (50.0) | |
| Never | 260 | (51.4) | 77 | (50.0) | |
| Radiation exposureb | 0.024 | ||||
| No | 504 | (98.6) | 147 | (95.5) | |
| Yes | 7 | (1.4) | 7 | (4.5) | |
a
Chi-square test, compared to controls.
b
Totals are less than the total number of individuals because of missing data.