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Table 4 Decomposition of GPs’ income inequality by demographic and practice factors

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

Variables Population Sharea Income Shareb Income Mean (PPPc) Gini Coefficient Gini Decomposition
Within Between Overlap Overall
Gender
 Male 0.534 0.639 8339.10 0.349 0.192 (0.476) 0.106 (0.263) 0.104 (0.260) 0.403
 Female 0.466 0.361 5389.94 0.434
 Overall 1 1   0.403
Age
 26–35 years 0.255 0.204 5919.32 0.418 0.109 (0.271) 0.076 (0.190) 0.216 (0.538) 0.403
 36–45 years 0.291 0.299 7161.36 0.378
 46–55 years 0.353 0.383 7738.72 0.392
  ≥ 56 years 0.101 0.094 6439.79 0.426
 Overall 1 1   0.403
Marital status
 Single 0.186 0.146 5438.25 0.379 0.288 (0.716) 0.044 (0.111) 0.069 (0.172) 0.403
 Married 0.814 0.854 7304.91 0.404
 Over all 1 1   0.403
Practice setting
 Salaried 0.442 0.346 5471.60 0.389 0.201 (0.498) 0.098 (0.244) 0.103 (0.256) 0.403
 Self-employed 0.558 0.654 8134.69 0.388
 Overall 1 1   0.403
Family Physician
 No 0.886 0.881 6915.29 0.414 0.327 (0.811) 0.010 (0.026) 0.065 (0.161) 0.403
 Yes 0.114 0.109 7153.44 0.306
 Overall 1 1   0.403
Practice location
 Capital of the country 0.372 0.414 6306.80 0.434 0.101 (0.250) 0.161 (0.399) 0.140 (0.349) 0.403
 Province centers 0.289 0.235 6808.16 0.406
 Other cities, villages 0.339 0.351 7435.22 0.337
 Overall 1 1   0.403
Practice experience
 0–5 years 0.266 0.216 5624.94 0.375 0.074 (0.184) 0.116 (0.287) 0.212 (0.527) 0.403
 6–10 years 0.161 0.143 6659.05 0.463
 11–15 years 0.192 0.196 6860.18 0.358
 16–20 years 0.218 0.260 8358.44 0.370
  ≥ 21 years 0.163 0.185 7670.13 0.403
 Overall 1 1   0.403
  1. aContribution of each group to the whole population
  2. bEach group’s share of total income
  3. cPurchasing Power Parity