Association of systemic immune-inflammation index with all-cause mortality in lung cancer patients undergoing radiotherapy: a retrospective cohort study.

In the fully adjusted model (Model 3), HRs were 2.583 (95% CI: 1.630–4.095) for T2 and 4.475 (95% CI: 2.841–7.047) for T3, with a significant trend across tertiles (P for trend < 0.001). 3.3 Subgroup analysis stratified by age and sex After multivariable adjustment, subgroup analyses indicated that the association between SII and all-cause mortality varied across age and sex categories ( Table 5 ).

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