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Table 4 Decomposition of socioeconomic inequalities in MH use among Iranian households

From: Exploring socioeconomic inequalities in the use of medicinal herbs among Iranian households: evidence from a national cross-sectional survey

  Marginal effect Elasticity Cx Contribution to the Cn
Contribution % Summed%
Demographic variables
Sex of household head
  Male (ref.)       
  Female 0.0006 0.0016 −0.3057 − 0.0005 − 0.3 − 0.3
Age of household head
  15–45 (ref.)       
  46–65 0.0002 0.0015 0.0855 0.0001 0.1  
  66 and above 0.0016 0.0064 −0.1626 −0.0011 − 0.7 − 0.6
Socioeconomic variables
Education status of household head
  Illiterate (ref.)       
  Primary school 0.0052 0.0141 −0.0260 −0.0004 −0.3  
  Secondary school 0.0024 0.0488 0.0458 0.0023 1.5  
  High school 0.0128 0.0492 0.1699 0.0088 5.8  
  Academic degree 0.0117 0.0000 0.2844 0.0000 0.0 7.1
Wealth index of households
  Poorest (ref.)       
  Poor 0.0092 0.0393 −0.4021 −0.0166 −10.9  
  Middle 0.0121 0.0515 −0.0018 −0.0001 − 0.1  
   Rich 0.0160 0.0678 0.3987 0.0284 18.7  
  Richest 0.0172 0.0733 0.7996 0.0615 40.5 48.2
Ecological variables
Geographical area
  Urban (ref.)       
  Rural −0.0103 −0.1042 0.0943 −0.0103 −6.8 −6.7
Province category based on HDI
  Low (ref.)       
  Middle 0.0082 0.0570 −0.0296 −0.0018 −1.2  
  High 0.0290 0.1917 0.1654 0.0333 21.9 20.7
Sum     0.1037   68.3
Residuals     0.0482   31.7
The Cn     0.1519   100.0