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Table 5 Estimates of Probit model with sample selection

From: Horizontal equity in access to public GP services by socioeconomic group: potential bias due to a compartmentalised approach

Public GP equation

Probit equation

Selection equation

Coefficient (se)

p-value

Coefficient (se)

p-value

Female

0.1081 (0.0186)

0.000

−0.0767 (0.0227)

0.001

Age 15–34

Ref.

Ref.

Ref.

Ref.

Age 35–44

−0.0215 (0.0339)

0.525

−0.023 (0.0409)

0.574

Age 45–54

−0.0112 (0.0337)

0.739

−0.0342 (0.0408)

0.401

Age 55–64

0.0488 (0.0337)

0.148

−0.0073 (0.0413)

0.861

Age more than 64

0.1073 (0.0368)

0.004

0.0914 (0.0451)

0.043

Health very good

Ref.

Ref.

Ref.

Ref.

Health good

0.2163 (0.0287)

0.000

−0.2048 (0.0365)

0.000

Health fair

0.6757 (0.0335)

0.000

−0.5386 (0.0418)

0.000

Health bad

1.0275 (0.0441)

0.000

−0.791 (0.0514)

0.000

Health very bad

1.0957 (0.0676)

0.000

−0.8163 (0.0737)

0.000

Chronics

0.43 (0.0252)

0.000

−0.2672 (0.0309)

0.000

Inactive

Ref.

Ref.

Ref.

Ref.

Employed

−0.135 (0.0286)

0.000

0.1467 (0.0345)

0.000

Unemployed

−0.0699 (0.0366)

0.056

0.0883 (0.045)

0.050

Primary studies or less

Ref.

Ref.

Ref.

Ref.

Obligatory Secondary studies

0.046 (0.0264)

0.082

−0.1637 (0.0337)

0.000

Occupational training or pre-university studies

0.0486 (0.0311)

0.117

−0.2133 (0.0383)

0.000

University studies

0.1371 (0.0385)

0.000

−0.3884 (0.0431)

0.000

High social class (SC)

Ref.

Ref.

Ref.

Ref.

Medium-high SC

0.0084 (0.0321)

0.794

0.115 (0.0344)

0.001

Medium-low SC

0.0343 (0.0352)

0.329

0.2036 (0.0379)

0.000

Low social class

0.05 (0.0406)

0.217

0.2604 (0.0462)

0.000

Double coverage

  

−0.4081 (0.0302)

0.000

Intercept

−1.1554 (0.0564)

0.000

1.7604 (0.0627)

0.000

rho

−0.8660 (0.0537)

0.000

 

N

19,727

22,450