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Table 4 Arterial Blood Gas Analysis in the ED

From: Emergency department length of stay for patients requiring mechanical ventilation: a prospective observational study

  No ABG Univariate Multivariate
  n/N % [95% CI] OR [95% CI] OR [95% CI]
Site   
ED1 73/222 33 [27–39] 1 1
ED2 119/199 60 [53–67] 3.0 [2.0–4.5] 2.5 [1.6–3.9]
ED3 65/99 66 [56–75] 3.9 [2.4–6.4] 3.7 [2.1–6.7]
ED4 20/98 20 [12–28] 0.5 [0.3–0.9] 0.6 [0.3–1.2]
ED LOS (h) 1.0 [0.9–1.0] 1.0 [0.9–1.0]
Ventilation type    
Invasive 215/484 44 [40–49] 1 1
Non-invasive 54/118 46 [37–55] 1.1 [0.7–1.6] 1.6 [0.8–3.3]
Both 8/16 50 [26–75] 1.3 [0.5–3.4] 5.3 [1.5–19.2]
Reason for ventilation     
Respiratory/cardiac 70/182 39 [31–46] 1 1
Trauma 65/168 39 [31–46] 1.0 [0.7–1.6] 0.9 [0.6–1.6]
Neurological 66/124 53 [45–62] 1.8 [1.1–2.9] 1.9 [1.1–3.3]
Cardiac arrest 32/62 20 [14–26] 1.7 [1.0–3.1] 1.9 [1.0–3.9]
Other 12/21 57 [36–78] 2.1 [0.9–5.3] 2.4 [0.9–6.5]
  1. ABG = arterial blood gas, OR = odds ratio, CI = confidence interval, ED = emergency department, LOS = length of stay.