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Table 7 Survival time analysis until the third year after inclusion (independent risk factors) in patients surviving more than 150 days

From: Acute and long-term survival in chronically critically ill surgical patients: a retrospective observational study

  P value Hazard ratio (95% confidence interval)
Age (per year) 0.019 1.044 (1.007–1.083)
Time-dependent covariate for age 0.028 0.949 (0.905–0.994)
Duration of mechanical ventilationa 0.007 2.306 (1.250–4.254)
Palliative surgery < 0.001 4.458 (2.032–9.778)
Number of surgical revisions (per revision)b 0.005 0.097 (0.019–0.495)
Surgery for malignant diseases 0.010 2.339 (1.227–4.460)
  1. aFor patients ventilated for more than 50 days. bAfter quadratic transformation.