Table 2. Tumor staging and treatment variables stratified by the SES tertiles (the Yost Index).
| Characteristic | First tertile ( n = 1,935) | Second tertile ( n = 1,998) | Third tertile ( n = 1,699) | p -Value a |
|---|---|---|---|---|
| Overall stage of disease | <0.001 | |||
| I | 136 (7.0%) | 208 (10%) | 186 (11%) | |
| II | 373 (19%) | 467 (23%) | 405 (24%) | |
| III | 567 (29%) | 536 (27%) | 522 (31%) | |
| IVa | 372 (19%) | 336 (17%) | 269 (16%) | |
| IVb | 227 (12%) | 211 (11%) | 143 (8.4%) | |
| IVc | 260 (13%) | 240 (12%) | 174 (10%) | |
| Chemotherapy (yes) | 1,514 (78%) | 1,574 (79%) | 1,372 (81%) | 0.151 |
| Surgery (yes) | 196 (10%) | 227 (11%) | 222 (13%) | 0.021 |
| Radiation (yes) | 1,607 (83%) | 1,699 (85%) | 1,488 (88%) | <0.001 |
Abbreviation: SES, socioeconomic status.
a
Statistical tests performed: Chi-square test of independence.
Note: Figures in bold indicate statistical significance p < 0.05.