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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