Table 1a. Clinical and demographic characteristics of patients by Chemotherapy administration.
| Variables | Level | Chemotherapy (N=23535) | No Chemotherapy (N=23816) | P-value* |
|---|---|---|---|---|
| Year of diagnosis | 1985-1990 | 3396 (38.02) | 5535 (61.98) | <.001 |
| 1991-1995 | 5121 (55.03) | 4184 (44.97) | ||
| 1996-2000 | 5371 (49.9) | 5392 (50.1) | ||
| 2001-2005 | 9647 (52.57) | 8705 (47.43) | ||
| Race | White | 20627 (50.2) | 20465 (49.8) | <.001 |
| Black | 1610 (47.48) | 1781 (52.52) | ||
| Other | 548 (40.65) | 800 (59.35) | ||
| Asian | 353 (53.4) | 308 (46.6) | ||
| Hispanic | 202 (48.79) | 212 (51.21) | ||
| Gender | Male | 11891 (48.63) | 12560 (51.37) | <.001 |
| Female | 11644 (50.85) | 11256 (49.15) | ||
| Medicare Status Code | Aged | 21120 (50.16) | 20988 (49.84) | <.001 |
| Others | 2413 (46.16) | 2815 (53.84) | ||
| Urban/Rural | Urban/Metro | 21143 (48.72) | 22250 (51.28) | <.001 |
| Less Urban/Rural | 2391 (60.42) | 1566 (39.58) | ||
| Radiation | Yes | 10798 (57.72) | 7908 (42.28) | <.001 |
| No | 12737 (44.47) | 15908 (55.53) | ||
| Radiation type | Brain and/or CNS | 1063 (54.23) | 897 (45.77) | <.001 |
| Others | 9735 (58.13) | 7011 (41.87) | ||
| Surgery | Yes | 1274 (49.96) | 1276 (50.04) | 0.965 |
| No | 21896 (49.92) | 21970 (50.08) | ||
| Stage | IV | 10629 (48.58) | 11249 (51.42) | <.001 |
| Others | 7201 (54.52) | 6008 (45.48) | ||
| Age at diagnosis | Median (Range) | 71 (27 - 101) | 72 (24 - 99) | <.001 |
Data are presented as number of patients (%) or median (range).
*
The p-value is calculated by Wilcoxon rank-sum test for age; and chi-square test or Fisher's exact test for categorical covariates, where appropriate.