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Table 24 Findings from fitted multivariable Poisson, NB, ZIP, and ZINB regression models for hospital LOS, n = 2,167

From: A comparison of statistical methods for modeling count data with an application to hospital length of stay

Parameter

Poisson

 

NB

 

ZIP

 

ZINB

 
 

Estimate (SE)

P-Value

Estimate (SE)

P-Value

Estimate (SE)

P-Value

Estimate (SE)

P-Value

Age

-0.001 (0.0002)

 < .0001

-0.001 (0.0004)

0.0546

-0.001 (0.0002)

0.0002

-0.001 (0.0004)

0.0561

Sex

 Female

0.03 (0.02)

0.1086

0.03 (0.03)

0.4651

0.02 (0.02)

0.1247

0.03 (0.03)

0.4414

 Male

reference

 

reference

 

reference

 

reference

 

Health insurance

 Government

0.32 (0.11)

0.0045

0.32 (0.21)

0.1228

0.26 (0.11)

0.0215

0.26 (0.21)

0.2129

 Medicaid

0.49 (0.11)

 < .0001

0.49 (0.20)

0.0131

0.44 (0.11)

 < .0001

0.43 (0.20)

0.0319

 Medicare

0.46 (0.11)

 < .0001

0.46 (0.19)

0.0189

0.41 (0.11)

0.0001

0.40 (0.20)

0.0445

 Private

0.41 (0.11)

0.0001

0.40 (0.19)

0.0372

0.35 (0.11)

0.0009

0.35 (0.20)

0.0796

 Self-pay

reference

 

reference

 

reference

 

reference

 

Admission type

 Elective

-0.30 (0.05)

 < .0001

-0.29 (0.12)

0.0159

-0.29 (0.05)

 < .0001

-0.29 (0.12)

0.0160

 Emergency

-0.17 (0.05)

0.0011

-0.16 (0.12)

0.1649

-0.16 (0.05)

0.0025

-0.16 (0.12)

0.1667

 Urgent

reference

 

reference

 

reference

 

reference

 

Zero Model

Estimate (SE)

P-Value

Estimate (SE)

P-Value

Estimate (SE)

P-Value

Estimate (SE)

P-Value

Age

    

0.003 (0.004)

0.5015

0.07 (0.13)

0.5722

Sex

 Female

    

-0.09 (0.43)

0.8437

18.10 (4082.56)

0.9965

 Male

    

reference

 

reference

 

Health insurance

 Government

    

-14.35 (528.33)

0.9787

-22.23 (16,904.72)

0.9990

 Medicaid

    

-1.55 (1.23)

0.2057

-34.36 (4533.48)

0.9940

 Medicare

    

-1.56 (1.17)

0.1800

-37.75 (4039.53)

0.9925

 Private

    

-2.22 (1.19)

0.0662

-22.36 (5537.88)

0.9968

 Self-pay

    

reference

 

reference

 

Admission type

 Elective

    

12.99 (810.38)

0.9871

1.81 (20,295.23)

0.9999

 Emergency

    

12.72 (810.38)

0.9873

17.23 (19,158.48)

0.9993

 Urgent

    

reference

 

reference

 

Pearson Chi-Square (value/degrees of freedom)

5.3016

 

1.1815

 

4.9001

 

1.1868

 

AIC

17,675.4989

 

13,134.7955

 

17,560.4274

 

13,150.2305

 

BIC

17,726.6288

 

13,191.6065

 

17,662.6872

 

13,258.1713

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