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Table 3 Multivariable logistic regression analysis of mortality by age subgroups

From: The elderly age criterion for increased in-hospital mortality in trauma patients: a retrospective cohort study

Variable Subgroup analysis Comparison between two groups
≤ 64 years of age ≥ 65 years of age ≥ 65 years of agea
OR (95% CI) p-value OR (95% CI) p-value OR (95% CI) p-value
Age 1.038 (1.032, 1.044) < 0.001 1.059 (1.050, 1.068) < 0.001 4.585 (4.158, 5.055) < 0.001
Female 0.723 (0.616, 0.850) 0.001 0.789 (0.696, 0.894) < 0.001 0.813 (0.737, 0.897) < 0.001
Trauma mechanism       
Motor vehicle collision    Reference    
Fall 1.290 (1.094, 1.522) 0.003 0.843 (0.725, 0.980) 0.026 1.224 (1.096, 1.366) < 0.001
Blunt injury 0.463 (0.352, 0.610) < 0.001 0.524 (0.377, 0.727) < 0.001 0.462 (0.376, 0.568) < 0.001
Penetrating injury 0.688 (0.464, 1.020) 0.064 0.701 (0.434, 1.132) 0.146 0.701 (0.523, 0.938) 0.017
Otherb 0.617 (0.504, 0.756) < 0.001 0.681 (0.560, 0.827) < 0.001 0.686 (0.596, 0.789) < 0.001
Vital signs       
SBP (mmHg) 0.986 (0.985, 0.988) < 0.001 0.992 (0.990, 0.993) < 0.001 0.989 (0.988, 0.990) < 0.001
DBP (mmHg) 1.003 (1.002, 1.004) < 0.001 1.002 (1.001, 1.003) < 0.001 1.002 (1.002, 1.003) < 0.001
HR (beats/min) 1.002 (1.001, 1.004) 0.011 1.003 (1.002, 1.005) < 0.001 1.002 (1.001, 1.004) < 0.001
RR (breath/min) 1.009 (1.007, 1.010) < 0.001 1.004 (1.003, 1.005) < 0.001 1.006 (1.005, 1.008) < 0.001
BT (°C)       
GCS 0.603 (0.593, 0.613) < 0.001 0.678 (0.668, 0.688) < 0.001 0.635 (0.629, 0.642) < 0.001
EMR-ISS 1.028 (1.025, 1.031) < 0.001 1.036 (1.033, 1.039) < 0.001 1.033 (1.031, 1.035) < 0.001
  1. BT, body temperature; CI, confidence interval; DBP, diastolic blood pressure; EMR-ISS, excess mortality ratio–adjusted Injury Severity Score; GCS, Glasgow Coma Scale; HR, heart rate; OR, odds ratio; RR, respiratory rate; SBP, systolic blood pressure
  2. aReference group is ≤ 64 years of age
  3. bOther contains the low-frequency injury mechanisms, such as explosions or foreign bodies