Table 1. Characteristics of Patients from SEER Database by age.
| Characteristic | Total | Young Group | Elderly Group | p value |
|---|---|---|---|---|
| 27255 | 2102 | 25153 | ||
| Media follow up (mo) | 24 | 16 | P < 0.001 | |
| (IQR) | 1–20 | 1–14 | ||
| Years of diagnosis | P < 0.001 | |||
| 1988–1993 | 4505 | 391 | 4114 | |
| 1994–1999 | 8525 | 698 | 7827 | |
| 2000–2003 | 14225 | 1003 | 13222 | |
| Sex | P < 0.001 | |||
| Male | 19324 | 1582 | 17742 | |
| Female | 7931 | 520 | 7411 | |
| Race | P < 0.001 | |||
| Caucasian | 17891 | 1109 | 16782 | |
| African American | 2998 | 277 | 2721 | |
| Others | 6287 | 708 | 5579 | |
| Unknowns | 79 | 8 | 71 | |
| Primary site | P < 0.001 | |||
| Liver | 24317 | 1924 | 22393 | |
| Intrahepatic bile duct | 2938 | 178 | 2760 | |
| Pathological grading | P < 0.001 | |||
| High/Moderate | 6548 | 481 | 6067 | |
| Poor/undifferentiation | 3023 | 317 | 2706 | |
| Unknown | 17684 | 1304 | 16380 | |
| Histological Type | P < 0.001 | |||
| Hepatocellular carcinoma | 23547 | 1846 | 21701 | |
| Cholangiocarcinoma | 3502 | 228 | 3274 | |
| Combined | 206 | 28 | 178 | |
| Stage | P < 0.001 | |||
| Localized | 9100 | 627 | 8473 | |
| Regional | 7077 | 627 | 6450 | |
| Distant | 5467 | 541 | 4926 | |
| Unstaged | 5611 | 307 | 5304 | |
| Tumor size | P < 0.001 | |||
| < 3cm | 2088 | 169 | 1919 | |
| 3–5cm | 4155 | 255 | 3900 | |
| > 5cm | 7618 | 697 | 6921 | |
| Not stated | 13394 | 981 | 12413 |