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Table 3 Summary of the explicative model substituting zero responses for WTP or WTA for their estimated values.

From: Differences between willingness to pay and willingness to accept for visits by a family physician: A contingent valuation study

 

Unstandardized coefficients

t

Sig.

95%

LLCI

95% ULCI

VIF

 

B

Robust

S.E.

     

Constant

0.447

0.213

2.09

0.037

0.026

0.867

 

Social Class*

       

Group I

-0.581

0.161

-3.61

<0.001

-0.897

-0.265

1.95

Group II

-0.653

0.159

-4.11

<0.001

-0.966

-0.340

1.91

Group III

-0.455

0.161

-2.81

0.005

-0.773

-0.137

1.78

Group IV

-0.424

0.145

-2.92

0.004

-0.709

-0.138

2.33

Age

0.015

0.003

5.05

<0.001

0.009

0.021

1.44

Income in the Area (Lower vs Upper tercile)

0.242

0.084

2.86

0.004

0.076

0.408

1.20

Adjusted family income (by 1000 €)

-0.117

0.035

-3.32

0.001

-0.186

-0.047

1.34

Chronic Illness

-0.221

0.087

-2.53

0.012

-0.393

-0.050

1.39

  1. N 451, F 10.72, p < 0.001, Adjusted R2 0.185, Mean VIF 1.67
  2. Dependent variable ln (WTA/WTP)
  3. Robust S.E.: Robust standard error estimations
  4. Sig: Significance
  5. 95% LLCI: Lower Limit of the B 95% Confidence Interval
  6. 95% ULCI: Upper Limit of the B 95% Confidence Interval
  7. VIF: Variance Inflation Factor
  8. * Reference for Social Class: Group V