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Table 2 Regression models of outcome parameters

From: Impact of a remifentanil supply shortage on mechanical ventilation in a tertiary care hospital: a retrospective comparison

Model Coefficient RR 95% CI Pr(>|z|)
Primary outcome: Invasive mechanical ventilation hoursa
 Group only Intercept 74.46 73.05–75.89 <0.001*
Shortage group 2.19 2.14–2.24 <0.001*
 Confounder Intercept 20.89 19.39–22.49 <0.001*
Shortage group 1.47 1.43–1.51 <0.001*
Age 0.99 0.99–0.99 <0.001*
Sex, female 1.08 1.06–1.11 <0.001*
BMI§ 1.019 1.016 -1.021 <0.001*
SAPS III§ 0.996 0.995–0.997 <0.001*
SOFAmax 1.114 1.109–1.118 <0.001*
Prim. tracheostomy 1.18 1.11–1.26 <0.001*
Sec. tracheostomy 5.68 5.52–5.84 <0.001*
COPD 0.85 0.81–0.88 <0.001*
Intracranial OP/TBI 1.61 1.56–1.66 <0.001*
Coma 0.99 0.95–1.03 0.522
Delirium 1.18 1.13–1.19 <0.001*
Secondary outcome: Length of ICU stay, daysa
 Group only Intercept 8.93 8.45–9.43 <0.001*
Shortage group 1.55 1.45–1.67 <0.001*
Secondary outcome: Days with non-invasive ventilation, daysa
 Group only Intercept 1.84 1.62–2.08 <0.001*
Shortage group 0.27 0.21–0.35 <0.001*
Secondary outcome: Length of hospital stay, daysa
 Group only Intercept 33.04 32.10–33.99 <0.001*
Shortage group 1.40 1.35–1.46 <0.001*
Secondary outcome: Occurrence of pneumoniab
 Group only Intercept 0.13 0.08–0.20 <0.001*
Shortage group 1.84 1.04–3.35 0.040
Secondary outcome: Occurrence of sepsisb
 Group only Intercept 0.09 0.05–0.14 <0.001*
Shortage group 1.96 0.99–4.09 0.061
  1. Abbreviations: BMI body mass index, CI confidence interval, COPD chronic obstructive pulmonary disease, ICU intensive care unit, OP/TBI intracranial operation/traumatic brain injury, RR risk ratio, SAPS III Simplified Acute Physiology Score III, SOFA Sequential/Sepsis-related Organ Failure Assessment
  2. Statistical methods: aPoisson count regression model. bLogistic regression model. *Significant
  3. §For clearer readability, the third decimal place was added