Table 2.
Cox hazard regression of predictors of survival.
| Variable | HR | 95% of HR | p value |
|---|---|---|---|
| Age | |||
| 0–40 years (reference) | 1 | ||
| 41–60 years | 0.97 | 0.67–1.38 | 0.866 |
| 61–80 years | 1.62 | 1.15–2.30 | 0.006 |
| >81 years | 3.79 | 2.65–5.41 | <0.01 |
|
| |||
| Race | |||
| American Indians/Alaska Natives (reference) | 1 | ||
| Whites | 1.42 | 0.80–2.56 | 0.21 |
| African Americans | 1.62 | 0.90–2.90 | 0.29 |
| Asians/Pacific Islanders | 1.19 | 0.60–2.198 | 0.30 |
|
| |||
| Gender | |||
| Female (reference) | 1 | ||
| Male | 1.08 | 0.97–1.20 | 0.13 |
|
| |||
| Stage | |||
| In situ (reference) | 1 | ||
| Localized only | 0.87 | 0.75–1.00 | 0.06 |
| Regional spread by direct extension only | 1.27 | 1.08–1.49 | 0.03 |
| Distant site(s)/node(s) involved | 2.8 | 2.35–3.36 | <0.01 |
| Unknown | 2.1 | 1.76–2.76 | <0.01 |
|
| |||
| Grade | |||
| Well differentiated (reference) | 1 | ||
| Moderately differentiated; | 1.37 | 1.15–1.64 | <0.01 |
| Poorly differentiated; differentiated | 2.15 | 1.76–2.63 | <0.01 |
| Undifferentiated; anaplastic | 1.81 | 1.37–2.88 | 0.01 |
| Cell type not determined | 1.11 | 0.92–1.34 | 0.24 |
|
| |||
| Surgery | |||
| Yes (reference) | 1 | ||
| No | 0.38 | 0.34–0.42 | <0.01 |