Table 2

Results of the multivariate models for hospital length of stay and total hospital cost

Predictor

Hospital Length of Stay

Total Hospital Cost


Coefficient

Impact of Factor (Percent Change on Outcome†)

p value

Coefficient

Impact of Factor (Percent Change on Outcome†)

p value


Admission Delay > 12 hrs (no = 0, yes = 1)

0.117

12.4% (6.6 - 18.5)

< .0001

0.104

11.0% (6.0 - 16.4)

< .0001

CTAS 1 - Resuscitation*

-0.084

-8.0% (-16.2 - 0.91)

0.0768

0.32

37.6% (26.9 - 49.3)

< .0001

CTAS 2 - Emergent*

0.0044

0.44% (-3.7 - 4.7)

0.84

0.079

8.2% (4.3 - 12.3)

< .0001

CTAS 4 - Less Urgent*

-0.033

-3.3% (-8.9 - 2.7)

0.27

-0.055

-5.3% (-10.2 - -0.21)

0.04

CTAS 5 - Non-Urgent*

-0.41

-33.8 (-57.6 - 3.9)

0.07

-0.51

-40% (-59.4 - -10.9)

0.011

Arrival by Ambulance (no = 0, yes = 1)

0.12

12.9% (8.7 - 17.3)

< .0001

0.168

18.3% (14.4 - 22.3)

< .0001

Sex (male = 0, female = 1)

-0.077

-7.4% ( -10.6 - -4.1)

< .0001

-0.041

-4.0% (-6.9 - -1.0)

0.009

Admit to ICU or OR ( no = 0, yes = 1)

-156

-14.5% (-19.1 - -9.6)

< .0001

0.19

21% (15.2 - 27.0)

< .0001

Age (years)

0.011

1.1% (1.0 - 1.2)

< .0001

0.0088

0.9% (0.8 - 1.0)

< .0001

Age2 (years2)

0.0000072

0.00072% (-0.004 - 0.005)

0.75

-0.000028

-0.003% (-0.007 - 0.001)

0.17

Site of ED

0.037

3.8% (0.2 -7.6)

0.04

0.038

3.9% (0.7 - 7.2)

0.016

CMGs 001-901

Included in model to adjust for the effects of disease conditions; individual values are not shown


* CTAS 3 -Urgent is the reference group

† Converted from the lognormal model to percentage impact by taking Exp(coefficient value); e.g., Exp(0.117) = 1.124, which corresponds to a 12.4% increase in hospital LOS associated with admission delay > 12 hours.

Huang et al. BMC Emergency Medicine 2010 10:16   doi:10.1186/1471-227X-10-16

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