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Table 1 Descriptive statistics of primary/secondary outcome parameters and confounding variables

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

Variable Shortage (n = 132) Control (n = 141) P value
Primary outcome parameter
 Mechanical ventilation, hours 35 (14–211) 23 (13–66)  
Secondary outcome parameters
 Length of ICU stay, days 7 (3–17) 5 (3–10)  
 Days with non-invasive ventilation 0 (0–0) 0 (0–1)  
 Length of hospital stay, days 37 (17–63) 19 (12–41)  
 Pneumonia occurrence, no. 31 (24) 18 (13)  
 Sepsis occurrence, no. 22 (17) 12 (9)  
Confounding variables
 Age, years 58 (49–71) 58 (45–69) 0.720a
 Sex, female 53 (40) 67 (48) 0.270b
 Body mass index, kg m−2 25 (22–30) 24 (22–28) 0.153a
 SAPS III at ICU admission 47 (40–57) 42 (34–50) <0.001c
 Maximum of SOFA score 8 (5–11) 7 (5–10) 0.600c
 Airway    0.004b
  Endotracheal tube 90 (68) 120 (85)  
  Primary tracheostomy 17 (13) 8 (6)  
  Secondary tracheostomy 25 (19) 13 (9)  
 COPD 18 (14) 21 (15) 0.902b
 Intracranial operation or TBI 19 (14) 22 (15) 0.913b
 Coma 7 (5) 4 (3) 0.467b
 Delirium 21 (16) 24 (17) 0.933b
  1. Abbreviations: COPD chronic obstructive pulmonary disease, ICU intensive care unit, SAPS III Simplified Acute Physiology Score III, SOFA Sequential/Sepsis-related Organ Failure Assessment, TBI traumatic brain injury
  2. Data are given as median with 25th and 75th percentile or absolute count with percentage
  3. Statistical methods: aWelch two-sample t test, bPearson’s chi-squared test with Yates’s continuity correction, cWilcoxon rank-sum test