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Table 4 Marginal effects: Patient demographics and Time-related variables

From: How do patient demographics, time-related variables, reasons for cancellation, and clinical procedures affect frequency of same-day operating room surgery cancelation? A maximum likelihood method

Probit regression

No. of obs = 357

Wald chi2(34) = 42.48

Log pseudo likelihood = − 138.506

Prob > chi2 = 0.1509

R2 = 0.1674

Dependent variable = Frequency of cancelation (1 = Once, 0 = More than once)

dF/dx

Robust Std. Err.

Z

P > z

x-bar

[95% C.I.]

Waiting time

0.019

0.009

2.1

0.036**

3.630

0.002

0.036

Adult

0.004

0.094

0.04

0.967

0.944

−0.180

0.188

Morning session

0.161

0.086

2.17

0.03**

0.880

−0.008

0.330

Male

0.115

0.053

2.11

0.035**

0.459

0.011

0.220

Riyadh Resident

−0.010

0.052

−0.19

0.849

0.832

−0.112

0.091

National

−0.168

0.028

−3.19

0.001**

0.902

−0.223

−0.113

Fasting

−0.293

0.198

−1.74

0.081

0.204

− 0.682

0.095

Summer

−0.163

0.169

−1.1

0.27

0.235

−0.494

0.168

Spring

−0.091

0.143

−0.68

0.497

0.339

−0.371

0.189

Fall/Autumn

−0.183

0.183

−1.17

0.244

0.182

−0.542

0.176

Single

0.002

0.050

0.05

0.96

0.218

−0.095

0.100

Divorced

−0.119

0.142

−0.99

0.321

0.017

−0.398

0.160

Widowed

−0.031

0.089

−0.38

0.707

0.048

−0.206

0.143

Unknown

−0.326

0.165

−2.43

0.015**

0.045

−0.649

−0.003

Surgical procedures (reference = hernia)

Others

−0.049

0.066

−0.72

0.472

0.557

−0.178

0.081

ECCE IOL

−0.004

0.096

−0.04

0.966

0.092

− 0.192

0.184

Lap Cholecystetomy

−0.153

0.144

−1.26

0.209

0.081

−0.435

0.129

Phaco IOL

−0.174

0.120

−1.7

0.089

0.120

−0.410

0.062

Septoplasty

−0.167

0.198

−1.03

0.302

0.034

−0.555

0.221

Reasons for cancelation (reference = Unwell on day of surgery)

Others

0.010

0.053

0.18

0.857

0.235

−0.093

0.113

Aspirin intake

0.091

0.051

1.15

0.248

0.039

−0.010

0.191

No O.R time

0.139

0.030

2.37

0.018**

0.126

0.080

0.199

Not indicated

0.017

0.063

0.27

0.791

0.120

−0.105

0.140

Patient refusal

0.025

0.070

0.33

0.739

0.070

−0.112

0.162

Scheduling issues

−0.341

0.181

−2.29

0.022**

0.028

−0.696

0.015

Uncontrolled blood pressure

−0.071

0.088

−0.91

0.365

0.098

−0.242

0.101

Uncontrolled blood sugar

0.024

0.061

0.37

0.709

0.084

−0.095

0.143

Eligibility (reference = Saudi NGHA dependent

Others

−0.415

0.179

−2.7

0.007***

0.031

−0.765

−0.065

Saudi NGHA

−0.194

0.093

−2.36

0.018**

0.241

−0.377

−0.012

NGHA Employee

−0.483

0.233

−2.31

0.021**

0.028

−0.939

−0.027

NGHA Employee dependents

0.041

0.094

0.38

0.701

0.034

−0.143

0.226

Exceptions Saudi

−0.134

0.105

−1.49

0.135

0.078

−0.341

0.072

Exceptions 7 diseases

−0.350

0.283

−1.51

0.132

0.036

−0.905

0.205

Ineligible/out-of-pocket

−0.430

0.266

−1.88

0.06**

0.036

−0.951

0.091

  1. Obs. P = 0.823529
  2. Pred. P = 0.870344 (at x-bar)
  3. Canceled once = 1; canceled more than once = 0; Significant at ***p < 0.01; **p < .05
  4. (*) dF/dX is for discrete change of dummy variable from 0 to 1; z and p > |z| are the test of the underlying coefficient being 0
  5. Canceled once = 1; canceled more than once = 0