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Table 2 Determinants of EDLOS

From: Shorter laboratory turnaround time is associated with shorter emergency department length of stay: a retrospective cohort study

 

Change in EDLOS in minutesa (univariate) (95% CI)

Change in EDLOS in minutesa (multivariate) (95% CI)

p-value (multivariate)

TAT (in minutes)

0.50 (0.45–0.54)

0.32 (0.28–0.37)

<  0.001

TTT (in minutes)

0.50 (0.43–0.56)

0.56 (0.50–0.62)

<  0.001

time from the start of the study period (in days)

0.003 (− 0.001–0.007)

0.002 (− 0.002–0.006)

0.26

age (in years)

0.29 (0.22–0.36)

0.12 (0.05–0.19)

<  0.001

female sex

4.1 (1.7–6.5)

4.9 (2.6–7.2)

<  0.001

specialty

 medical

-b

-b

 surgical

16.7 (13.1–20.2)

14.0 (10.6–17.4)

<  0.001

 other

−36.4 (−58.7 – − 14.0)

−27.6 (− 49.1 – − 6.1)

0.01

time of day

 8:00–16:59

-b

-b

 17:00–0:59

−24.9 (−27.5 – −22.3)

−20.7 (−23.3 – − 18.2)

<  0.001

 1:00–7:59

− 34.6 (− 39.1 – − 30.2)

−25.7 (− 30.1 – − 21.4)

<  0.001

number of daily patients

0.28 (0.15–0.42)

0.20 (0.07–0.34)

0.003

number of abnormal tests

5.2 (4.87–5.6)

4.8 (4.4–5.3)

<  0.001

destination

 home

-b

-b

 admission

11.2 (8.8–13.6)

6.2 (3.7–8.7)

<  0.001

 transfer to another facility

97.2 (88.0–106.5)

90.0 (81.1–98.9)

<  0.001

 death

13.0 (−8.8–34.9)

53.2 (31.5–74.9)

<  0.001

ESI triage level

 level 1

-b

-b

 level 2

49.9 (42.3–57.5)

65.2 (57.7–72.7)

<  0.001

 level 3

66.2 (58.8–73.6)

75.4 (68.0–82.8)

<  0.001

 level 4

54.4 (45.6–63.1)

63.8 (55.1–72.5)

<  0.001

 level 5

24.3 (−14.7–63.3)

22.1 (− 15.4–59.6)

0.25

 not scored

8.6 (− 27.5–44.7)

12.0 (− 22.6–46.6)

0.50

  1. a The change in EDLOS is the change in minutes per one unit increase in the explanatory variable for continuous explanatory variables (minutes for TAT and TTT, days for the time from the start of the study period, years for age, and number for daily patients and abnormal tests. For categorical explanatory variables, it is the change in minutes compared to the reference category
  2. b Reference category. EDLOS: emergency department length of stay; CI: confidence interval; TAT: turnaround time; TTT: time to testing; ESI: Emergency Severity Index [23].