Table 3a. Overall survival analysis of year of diagnosis for patients treated and not treated with chemotherapy.
| Period (years) | N | Hazard Ratio (95% CI) | P-value | Overall P-value |
|---|---|---|---|---|
| Overall population treated with chemotherapy | 0.005 | |||
|
| ||||
| 1985-1990 | 1331 | 1 (Ref) | - | |
| 1991-1995 | 3666 | 1.027 (0.964 - 1.094) | 0.404 | |
| 1996-2000 | 4327 | 1.002 (0.941 - 1.066) | 0.956 | |
| 2001-2005 | 8393 | 0.959 (0.904 - 1.017) | 0.160 | |
|
| ||||
| Overall population not treated with chemotherapy | <.001 | |||
|
| ||||
| 1985-1990 | 1860 | 1 (Ref) | - | |
| 1991-1995 | 3075 | 0.992 (0.936 - 1.052) | 0.798 | |
| 1996-2000 | 4503 | 0.944 (0.894 - 0.997) | 0.039 | |
| 2001-2005 | 7664 | 0.918 (0.872 - 0.967) | 0.001 | |
Hazard Ratio is calculated by the multivariable Cox proportional hazards model with year of diagnosis after adjusting for age, sex, race, stage, Medicare status, urban/rural, and radiation.