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Table 2 Odds ratio (95% CI) for in-hospital mortality according to ICU grade and use of mechanical ventilator in South Korea, 2009 to 2014

From: The effect of bed-to-nurse ratio on hospital mortality of critically ill children on mechanical ventilation: a nationwide population-based study

Bed-to-nurse grade No. of patients No. of deaths (%) Model 1
OR (95% CI)
Model 2
OR (95% CI)
Overall
 Grade 1 11,691 531 (4.5) Reference Reference
 Grade 2 5095 345 (6.8) 1.71 (1.13–2.58) 2.49 (1.46–4.24)
 Grade 3 6797 468 (6.9) 1.83 (1.21–2.76) 3.61 (2.13–6.14)
 Grade 4 or above 4266 199 (4.7) 1.27 (0.83–1.95) 4.74 (2.65–8.46)
 p-value    0.003 < 0.01
No-mechanical ventilation
 Grade 1 5081 69 (1.4) Reference Reference
 Grade 2 2513 34 (1.4) 1.36 (0.69–2.66) 1.23 (0.63–2.39)
 Grade 3 4877 59 (1.2) 1.68 (0.90–3.14) 1.51 (0.80–2.86)
 Grade 4 or above 3750 25 (0.7) 1.27 (0.63–2.56) 0.99 (0.45–2.14)
 p-value    0.395 0.359
Mechanical ventilation
 Grade 1 6610 462 (7.0) Reference Reference
 Grade 2 2582 311 (12.0) 2.00 (1.24–3.24) 2.73 (1.51–4.95)
 Grade 3 1920 409 (21.3) 2.65 (1.65–4.25) 4.02 (2.23–7.26)
 Grade 4 or above 516 174 (33.7) 4.15 (2.50–6.89) 7.83 (4.07–15.07)
 p-value    < 0.01 < 0.01
  1. Model 1 adjusted for age, sex, and primary diagnosis
  2. Model 2 further adjusted for medical/surgical admission, hospital type, interventions for critical care (vasopressor drugs, extracorporeal membrane oxygenation, and hemodialysis)
  3. CI confidence interval, OR odds ratio, ICU intensive care unit