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Table 4 Cox proportional hazard regression analysis of transfusion ratio categories with 28-day mortality

From: Association between the plasma-to-red blood cell ratio and survival in geriatric and non-geriatric trauma patients undergoing massive transfusion: a retrospective cohort study

Plasma-to-RBC ratio category Non-geriatric group Geriatric group
n Age: 16–64 years p n Age: ≥ 65 years p
HR (95% CI) HR (95% CI)
Low 4,226 1.13 (1.05–1.22)  < 0.001 641 0.94 (0.92–1.21) 0.396
Medium 6,925 1.00 [Reference]   893 1.00 [Reference]  
High 1,062 1.07 (0.93–1.20) 0.383 114 0.92 (0.72–1.18) 0.53
  1. Patients were stratified according to the plasma-to-RBC ratio as follows: low < 0.5, medium 0.5–1.0, and high ≥ 1.0. Cox proportional hazard regression analysis controlling for age, sex, Injury Severity Scale, Revised Trauma Score, injured body region, and hospital types to evaluate the risk of mortality at 28 days between low, medium, and high groups in non-geriatric and geriatric groups. Plasma-to-RBC ratios at 4 and 24 h were treated as time-dependent covariates, and mortality for > 28 days was treated as survival in this model
  2. RBC red blood cell