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Table 5 Decomposition of GPs’ wage inequality by demographic and practice factors

From: Income inequality among general practitioners in Iran: a decomposition approach

Variables

Population

Sharea

Wage

Shareb

Wage Mean (PPPc)

Gini Coefficient

Gini Decomposition

Within

Between

Overlap

Overall

Gender

 Male

0.567

0.576

61.80

0.379

0.206 (0.501)

0.009 (0.023)

0.195 (0.475)

0.412

 Female

0.433

0.424

59.84

0.450

 Overall

1

1

 

0.412

Age

 26–35 years

0.196

0.192

53.45

0.419

0.118 (0.288)

0.108 (0.263)

0.184 (0.447)

0.412

 36–45 years

0.290

0.354

72.25

0.439

 46–55 years

0.386

0.398

62.79

0.376

  ≥ 56 years

0.148

0.076

39.57

0.357

 Overall

1

1

 

0.412

Marital status

 Single

0.152

0.117

46.28

0.399

0.312 (0.758)

0.047 (0.115)

0.051 (0.125)

0.412

 Married

0.848

0.883

63.56

0.410

 Over all

1

1

 

0.412

Practice setting

 Salaried

0.311

0.238

46.32

0.398

0.239 (0.580)

0.094 (0.231)

0.078 (0.189)

0.412

 Self-employed

0.689

0.762

67.75

0.401

 Overall

1

1

 

0.412

Family Physician

 No

0.902

0.920

62.33

0.417

0.347 (0.843)

0.027 (0.066)

0.037 (0.089)

0.412

 Yes

0.098

0.080

49.24

0.335

 Overall

1

1

 

0.412

Practice location

 Capital of the country

0.387

0.333

58.26

0.397

0.103 (0.251)

0.152 (0.368)

0.156 (0.379)

0.412

 Province centers

0.279

0.275

65.54

0.424

 Other cities, villages

0.354

0.392

57.07

0.383

 Overall

1

1

 

0.412

Practice experience

 0–5 years

0.211

0.189

51.51

0.402

0.079)0.192(

0.105)0.254 (

0.227)0.552(

0.412

 6–10 years

0.147

0.181

71.74

0.391

 11–15 years

0.196

0.209

64.97

0.478

 16–20 years

0.255

0.279

64.21

0.367

  ≥ 21 years

0.191

0.172

52.23

0.375

 Overall

1

1

 

0.412

  1. aContribution of each group to the whole population
  2. bEach group’s share of total wage
  3. cPurchasing Power Parity