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Table 7 Main effects parameter coefficients (dy/dx) for probit and eprobit

From: Modelling hospital outcome: problems with endogeneity

 

Probit

eProbit

dy/dx

P-value

95% CI (lower)

95% CI (upper) 

dy/dx

P-value

95% CI (lower)

95% CI (upper) 

Age_centered

0.0001

0.5810

−0.0002

0.0004

0.0001

0.3890

−0.0002

0.0004

APIII score_centered

0.0002

0.1570

−0.0001

0.0004

0.0022

0.0000

0.0020

0.0025

Gender

 Female

0.0000

   

0.0000

   

 Male

0.0001

0.9700

−0.0029

0.0030

0.0000

0.9810

− 0.0026

0.0026

AP III diagnostic codes

 Cardiovascular_medical

0.0000

   

0.0000

   

 Respiratory medical

−0.0056

0.0330

−0.0107

− 0.0005

0.0038

0.4040

−0.0052

0.0128

 Liver_GIS_medical

−0.0025

0.5190

−0.0100

0.0050

−0.0166

0.0120

−0.0296

−0.0036

 CNS_medical

0.0123

0.0000

0.0063

0.0183

−0.0030

0.6480

−0.0158

0.0098

 Sepsis

−0.0103

0.0000

−0.0156

−0.0050

− 0.0128

0.1330

− 0.0296

0.0039

 Trauma

0.0050

0.2280

−0.0031

0.0132

−0.0213

0.0180

−0.0388

−0.0037

 Metabolic Hormonal

0.0006

0.9110

−0.0107

0.0120

−0.1066

0.0000

−0.1178

−0.0955

 Haematologic

−0.0065

0.4590

−0.0237

0.0107

0.0352

0.2230

−0.0214

0.0918

 Renal_GUS

−0.0244

0.0000

−0.0349

−0.0140

− 0.0839

0.0000

− 0.0975

−0.0702

 Other medical disorders

0.0142

0.3020

−0.0128

0.0413

−0.0472

0.0070

−0.0815

−0.0130

 Musculoskeletal / Skin

−0.0074

0.5730

−0.0329

0.0182

−0.0583

0.0000

−0.0879

−0.0287

 Cardio-Vascular surgery

−0.0006

0.9070

−0.0103

0.0091

−0.0710

0.0000

−0.0875

−0.0545

 Thoracic surgery

0.0264

0.0070

0.0071

0.0457

−0.0536

0.0000

−0.0742

−0.0329

 GIS surgery

−0.0015

0.6730

−0.0085

0.0055

−0.0481

0.0000

−0.0615

−0.0346

 CNS surgery

0.0141

0.0150

0.0027

0.0254

0.0168

0.1070

−0.0036

0.0373

 Traumatic/Orthopaedic surgery

0.0004

0.9470

−0.0107

0.0114

−0.0475

0.0000

−0.0664

−0.0286

 Renal_GUS surgery

−0.0176

0.1000

−0.0387

0.0034

−0.0998

0.0000

−0.1148

−0.0848

 Gynaecological

0.0834

0.0540

−0.0014

0.1681

−0.1142

0.0000

−0.1380

−0.0904

 Musculoskeletal / Skin Surgery

0.0004

0.9530

−0.0138

0.0147

−0.0672

0.0000

−0.0814

−0.0530

 Metabolic Surgery

0.0427

0.2800

−0.0348

0.1201

−0.0854

0.0000

−0.1286

−0.0421

 Cardiovascular surgery elective

−0.0073

0.1330

−0.0168

0.0022

−0.1179

0.0000

−0.1302

−0.1056

 Thoracic surgery elective

−0.0074

0.5570

−0.0320

0.0172

−0.0839

0.0000

−0.1056

−0.0622

 GIS surgery elective

−0.0179

0.0040

−0.0300

−0.0059

− 0.0885

0.0000

− 0.0998

−0.0771

 CNS surgery elective

0.0227

0.0980

−0.0042

0.0496

−0.0685

0.0000

−0.0916

−0.0453

 Traumatic/Orthopaedic surgery el

−0.0345

0.1880

−0.0857

0.0168

−0.0946

0.0000

−0.1302

−0.0591

 Renal_GUS surgery elective

0.0220

0.2250

−0.0135

0.0575

−0.0972

0.0000

−0.1185

−0.0760

 Gynaecological surgery elective

−0.0491

0.1040

−0.1084

0.0101

−0.1264

0.0000

−0.1414

−0.1114

 Musculoskeletal / Skin Surgery el

−0.0058

0.5760

−0.0262

0.0146

−0.0982

0.0000

−0.1151

−0.0813

Annual volume_deciles

 Base

0.0000

   

0.0000

   

 2

0.0016

0.6740

−0.0058

0.0090

0.0010

0.7740

−0.0058

0.0077

 3

0.0092

0.0180

0.0016

0.0167

0.0064

0.0690

−0.0005

0.0134

 4

0.0017

0.7270

−0.0080

0.0114

0.0085

0.1110

−0.0020

0.0190

 5

−0.0008

0.8430

−0.0090

0.0074

0.0023

0.5740

−0.0057

0.0104

 6

0.0047

0.2750

−0.0038

0.0133

0.0050

0.2680

−0.0038

0.0138

 7

0.0032

0.4300

−0.0048

0.0112

0.0129

0.0040

0.0042

0.0217

 8

0.0020

0.6310

−0.0063

0.0104

0.0066

0.1300

−0.0020

0.0152

 9

−0.0030

0.5860

−0.0139

0.0078

−0.0042

0.4180

−0.0145

0.0060

 10

−0.0047

0.2280

−0.0125

0.0030

−0.0022

0.6290

−0.0112

0.0068

Hospital classification

 Metropolitan

0.0000

   

0.0000

   

 Private

0.0145

0.0000

0.0089

0.0201

0.0124

0.0000

0.0071

0.0178

 Rural / Regional

0.0034

0.2420

−0.0023

0.0092

0.0062

0.0260

0.0007

0.0117

 Tertiary

0.0164

0.0000

0.0120

0.0209

0.0117

0.0010

0.0049

0.0184

Ventilation status

 Not-ventilated

0.0000

   

0.0000

   

 Ventilated

−0.0058

0.0010

−0.0093

−0.0023

0.0309

0.0710

−0.0026

0.0645