Likelihood ratios, pre-and posttest odds for mortality were calculated.
Hazard ratio (HR) of hospital mortality were calculated.
ICU, hospital, 6-months and 1-year after hospital discharge mortality were calculated.
Hazard ratios (HRs) for all-cause and cause-specific mortality were calculated, with adjustment for sociodemographic and coronary heart disease (CHD) risk factors.
Treatment effects on mortality were calculated as log odds ratio (OR) of treatment vs. control group mortality.
Overall survival rates (in-hospital mortality) were calculated using the Kaplan Meier method, and differences in survival rates between groups were compared by the log-rank test.
Stratifying body mass index by percentile rank (< or = 15, 15 to 85, and > or = 85th percentiles), risk ratios for mortality were calculated by Cox Proportional Hazards using the 15th to 85th percentile of body mass index as the reference group while controlling for multiple variables such as prior weight loss, albumin, and Acute Physiology Score.
Eight common comorbid conditions were coded and compared between registry data (derived from medical record review) and claims data; hospital-level observed vs expected ratios and outlier status for 30-day readmission and mortality were calculated using logistic generalized estimating equations for clinical vs claims data.
Age-stratified (<65, 65-74, ≥ 75) hazard ratios for all-cause mortality were calculated for each problem individually and according to number of problems.One or more nondisease-specific problems occurred in 40% of participants younger than 65, 45% of those aged 65 to 74, and 55% of those aged 75 and older.
Adjusted odds ratio (aOR) and 95% confidence interval (CI) for in-hospital mortality were calculated after adjusting for sex, age, race/ethnicity, insurance, trauma center level, ED GCS, head AIS, mechanism of injury, presence of TBI polytrauma and TBI type.
Using these cutoff values, overall survival rates (in-hospital mortality) were calculated with the Kaplan Meier method, and differences in survival rates between groups were compared by the log-rank test.
