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Table 4 Summary of coefficients and incident rate ratios (IRR)

From: Predicting length of stay from an electronic patient record system: a primary total knee replacement example

 

Coefficient

Std. error

z value

Pr (>|z|)

Significance

IRR

(Intercept)

3.51500

0.32630

10.772

<2e-16

***

33.62

Admission.Year.Group2011

-0.0999

0.03409

-2.930

0.00339

**

0.90

Age.at.Admission

-0.04659

0.00933

-4.996

0.00000

***

0.95

Age.Squared

0.00043

0.00007

6.160

0.00000

***

1.00

GenderMale

-0.13760

0.02525

-5.450

0.00000

***

0.87

Consultant.Pseudo.Code.PK.GroupC38

0.07489

0.05752

1.302

0.19292

 

1.08

Consultant.Pseudo.Code.PK.GroupC42

0.11630

0.05977

1.946

0.05164

.

1.12

Consultant.Pseudo.Code.PK.GroupC46

0.13800

0.06180

2.234

0.02551

*

1.15

Consultant.Pseudo.Code.PK.GroupC49

0.01046

0.05734

0.182

0.85523

 

1.01

Consultant.Pseudo.Code.PK.GroupC58

0.06061

0.05859

1.034

0.30093

 

1.06

Consultant.Pseudo.Code.PK.GroupC59

-0.07585

0.06385

-1.188

0.23481

 

0.93

Consultant.Pseudo.Code.PK.GroupC62

0.17290

0.06781

2.550

0.01077

*

1.19

Consultant.Pseudo.Code.PK.GroupC64

0.03859

0.06718

0.574

0.56574

 

1.04

Consultant.Pseudo.Code.PK.GroupOther consultant

0.12170

0.05685

2.142

0.03223

*

1.13

Admission.DayMonday

-0.01045

0.04263

-0.245

0.80631

 

0.99

Admission.DaySaturday

-0.16110

0.04504

-3.578

0.00035

***

0.85

Admission.DaySunday

0.45220

0.07280

6.211

0.00000

***

1.57

Admission.DayThursday

0.00404

0.04522

0.089

0.92877

 

1.00

Admission.DayTuesday

0.10370

0.05123

2.024

0.04300

*

1.11

Admission.DayWednesday

0.01796

0.04357

0.412

0.68018

 

1.02

Discharge.Destination.PK.GroupOther discharge dest

0.10560

0.11270

0.937

0.34855

 

1.11

Discharge.Destination.PK.GroupUsual place of resid

-0.32660

0.05522

-5.915

0.00000

***

0.72

Rank.of.IMD.Score

-0.000005

0.00000

-2.901

0.00372

**

1.00

Ethnicity.Common.GroupWhite, declined and unknown

- 0.13000

0.07777

-1.671

0.09467

.

0.88

  1. 0 = ‘***’ : 0.001 = ‘**’ : 0.01 = ‘*’ 0.05 : ‘.’ = 0.1 : ‘ ’ = 1.
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BMC Medical Informatics and Decision Making

ISSN: 1472-6947

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