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

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

	Marginal effect	Elasticity	C_x	Contribution to the C_n
	Marginal effect	Elasticity	C_x	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 C_n				0.1519		100.0

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