Table 4.
Death risks of surgery strategies over NS among patients receiving chemotherapy for the sensitivity analyses
| Surgery strategies | All cohort | Propensity score matching cohort | Coarsened exact matching method weighted cohort | |||
|---|---|---|---|---|---|---|
| HR a (95% CI) | P value | HR b (95% CI) | P value | HR c (95% CI) | P value | |
| NS | Reference | Reference | Reference | |||
| GO | 0.61 (0.55, 0.67) | <0.001 | 0.56 (0.46, 0.69) | <0.001 | 0.64 (0.58, 0.70) | <0.001 |
| MO | 0.92 (0.82, 1.03) | 0.154 | 0.94 (0.77, 1.15) | 0.524 | 1.02 (0.95, 1.11) | 0.557 |
| SPM | 0.59 (0.51, 0.69) | <0.001 | 0.60 (0.49, 0.73) | <0.001 | 0.63 (0.57, 0.69) | <0.001 |
a After adjustment for age, race, SEER region, year of diagnosis, marriage status, primary tumor location and histology whose P value <0.05 in the univariable Cox regression analysis.
b After adjustment for year of diagnosis, primary tumor location and histology whose P value <0.05 in the univariable Cox regression analysis.
c After adjustment for age, sex, race, SEER region, year of diagnosis, marriage status, primary tumor location and histology whose P value <0.05 in the univariable Cox regression analysis.
Abbreviations: HR, hazard ratio; CI, confidence interval; NS, no surgery; GO, gastrectomy only; MO, metastasectomy only; SPM, surgery to both primary and metastatic tumor.