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Table 3 Cost drivers at patient level – quality included as 30 days mortality

From: Is quality costly? Patient and hospital cost drivers in vascular surgery

Variable name

Parameter estimate (2009 EURO’s)

Standard error

t value

Probability of estimate = 0

Department 1

1,374*

607

2.26

0.0236

Department 2

994

646

1.54

0.1240

Department 3

144

538

0.27

0.7891

Department 4

−530

530

−1.00

0.3171

Department 5

−691

534

−1.29

0.1959

Department 6

2,044*

530

3.86

0.0001

Department 7

−753

874

−0.86

0.3889

Department 8

1,494*

545

2.74

0.0061

Department 9

442

548

0.81

0.4199

2006

561*

258

2.18

0.0296

2007

1,827*

225

8.11

< .0001

2008

314

244

1.29

0.1987

2009

1,093*

228

4.79

< .0001

DRG index

4,832*

245

19.75

< .0001

DRG index squared

709*

52

13.72

< .0001

Age less than 50

−42

270

−0.16

0.8764

Age 50-60

9

229

0.04

0.9690

Age 70-80

166

183

0.91

0.3642

Age 80-90

179

238

0.75

0.4505

Age 90+

−1,443*

654

−2.21

0.0275

Woman

−571*

149

−3.84

0.0001

Daily smoker

−85

94

−0.90

0.3681

BMI information missing

1,221*

453

2.70

0.0070

Underweight

−338

443

−0.76

0.4457

Overweight

−2

195

−0.01

0.9935

Obese

340

263

1.29

0.1960

Very obese

−1,378

923

−1.49

0.1354

Diabetes

−168

106

−1.58

0.1132

Cerebral comorbidity

−146

83

−1.76

0.0787

Hypertension

−357*

124

−2.87

0.0041

Cardiac comorbidity

33

53

0.61

0.5390

Pulmonary comorbidity

504*

178

2.84

0.0045

Very acute admission

2,340*

555

4.22

< .0001

Acute admission

1,217*

326

3.74

0.0002

Elective

736*

304

2.42

0.0155

Severity information missing

−322

409

−0.79

0.4301

Moderate (ASA = 2)

−476*

204

−2.34

0.0195

Severe (ASA = 3)

−267

241

−1.11

0.2681

Very severe/fatal (ASA > 3)

1,552*

464

3.35

0.0008

Lenght of stay

549*

10

53.59

< .0001

30 days mortality

3,872*

423

9.15

< .0001

Number of observations

20,067

   

R 2

0.62

   
  1. NOTE: Parameter estimates that are statistically significant at 5 per cent level have the suffix *.